T83.511A

🦠 ICD-10 CM T83.511A — Infection and Inflammatory Reaction Due to Indwelling Urethral Catheter, Initial Encounter

Billable Code Confirmed

ICD-10-CM T83.511A is a valid, billable 8-character ICD-10-CM diagnosis code for FY2026 (effective October 1, 2016 — FY2017; unchanged through FY2026). Characters 1-3 (T83) identify the category as complications of genitourinary prosthetic devices, implants and grafts; character 4 (5) narrows to infection and inflammatory reaction; character 5 (1) specifies urinary catheter; character 6 (1) specifies indwelling urethral catheter (as distinct from cystostomy catheter, nephrostomy catheter, or ureteral stent); and the 7th character extension A designates initial encounter — active treatment phase. This code captures CAUTI (catheter-associated urinary tract infection) due specifically to an indwelling urethral (Foley) catheter.

Non-Billable Parent Codes — Never Submit These

• ❌ T83 — 3-character category header — does not specify type of complication
• ❌ T83.5 — 5-character subcategory — infection/inflammatory reaction; no catheter type or encounter specified
• ❌ T83.51 — 6-character subcategory — urinary catheter infection; no specific catheter type or encounter specified
• ❌ T83.511 — 7-character code — indwelling urethral catheter infection; missing the required 7th character extension (A, D, or S); invalid for submission without the 7th character

Always submit T83.511A (all 8 characters, including the 7th character extension) when active treatment is being provided for an infection/inflammatory reaction due to an indwelling urethral catheter.

Clinical Context: 7th Character Extension Required — A, D, or S

ICD-10-CM T83.511A requires a 7th character extension that specifies the phase of care:

• A — Initial encounter: Patient is receiving active treatment for the CAUTI. This does NOT mean the first visit — it means active management is ongoing. Use A at every encounter where the patient is being actively treated, regardless of provider or setting.
• T83.511D — Subsequent encounter: Active treatment has concluded; patient is in the follow-up/healing phase.
• T83.511S — Sequela: The CAUTI has resolved but has left a residual/late effect (e.g., urethral stricture, chronic bladder dysfunction attributable to the catheter infection).

Per ICD-10-CM Official Guidelines (Section I.C.19.a), the 7th character “A” is appropriate at any encounter during which active treatment is being provided — not just the first encounter with any provider.

⚠️ HAC — Hospital-Acquired Condition Payment Flag

CAUTI (T83.511A) is a CMS-designated Hospital-Acquired Condition (HAC). When assigned as a secondary diagnosis with POA indicator “N” (not present on admission — developed during the hospital stay), CMS will not pay the additional DRG weight this code would otherwise generate. The case is reimbursed as if T83.511A is absent. This is one of the original HAC conditions under the Deficit Reduction Act of 2005 and the HAC Reduction Program (HACRP) — hospitals with high HAC scores in the worst-performing quartile receive a 1% overall Medicare payment reduction for the fiscal year. Accurate POA indicator assignment for T83.511A is therefore critical for both coding compliance and hospital reimbursement integrity.

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🔍 Code Description

ICD-10-CM T83.511A classifies an infection and inflammatory reaction due to an indwelling urethral catheter (commonly called a Foley catheter) during the initial encounter (active treatment phase). This is the primary ICD-10-CM code for catheter-associated urinary tract infection (CAUTI) — one of the most common and costly healthcare-associated infections (HAIs) in acute and long-term care settings, tracked by the CDC’s National Healthcare Safety Network (NHSN) and subject to CMS HAC payment penalties.

Clinically, CAUTI develops when microorganisms colonize the biofilm on the catheter surface and ascend into the bladder, ureters, or kidneys. NHSN data documents CAUTI rates of 3.1 to 7.5 infections per 1,000 catheter-days in U.S. acute care hospitals, with rates as high as 35.2 per 1,000 catheter-days in some ward types. Common organisms include E. coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Enterococcus spp., Candida spp., and Staphylococcus spp. The code applies only to the indwelling urethral catheter — each other urinary catheter/device type has its own code within the T83.51x family (cystostomy: T83.510A; nephrostomy: T83.512A; other urinary catheter: T83.518A).

Critical tabular instruction: The T83.5 subcategory carries a “Use additional code to identify infection” instruction. This means T83.511A must always be paired with a code identifying the causative organism or the type of infection — most commonly N39.0 (urinary tract infection, site not specified) and/or an organism code from B95-B97 or B96.x. This dual-code assignment is mandatory, not optional.

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🌳 Code Tree / Hierarchy

T83   Complications of genitourinary prosthetic devices, implants and grafts ❌ Non-billable
│   Excludes2: failure and rejection of transplanted organs and tissue (T86.-)
│
├── T83.0   Mechanical complication of urinary catheter ❌ Non-billable
│
├── T83.1   Mechanical complication of other urinary devices and implants ❌ Non-billable
│
├── T83.2   Mechanical complication of graft of urinary organ ❌ Non-billable
│
├── T83.3   Mechanical complication of intrauterine contraceptive device ❌ Non-billable
│
├── T83.4   Mechanical complication of other prosthetic devices, implants and grafts of genital tract ❌ Non-billable
│
├── T83.5   Infection and inflammatory reaction due to prosthetic device, implant and graft in urinary system ❌ Non-billable
│   │   Use additional code to identify infection ← MANDATORY ADDITIONAL CODE
│   │   Excludes2: complications of stoma of urinary tract (N99.5-)
│   │
│   ├── T83.51   Infection and inflammatory reaction due to urinary catheter ❌ Non-billable
│   │   │
│   │   ├── T83.510A / D / S   Infection/inflammatory reaction due to cystostomy catheter ✅ Billable
│   │   ├── ▶▶ T83.511A ◀◀    Infection/inflammatory reaction due to indwelling urethral catheter, initial encounter ← YOU ARE HERE ✅ Billable
│   │   ├── T83.511D            Infection/inflammatory reaction due to indwelling urethral catheter, subsequent encounter ✅ Billable
│   │   ├── T83.511S            Infection/inflammatory reaction due to indwelling urethral catheter, sequela ✅ Billable
│   │   ├── T83.512A / D / S   Infection/inflammatory reaction due to nephrostomy catheter ✅ Billable
│   │   └── T83.518A / D / S   Infection/inflammatory reaction due to other urinary catheter ✅ Billable
│   │
│   ├── T83.59   Infection/inflammatory reaction due to other prosthetic device, implant and graft in urinary system ❌ Non-billable
│   │   ├── T83.590A / D / S   Infection/inflammatory reaction due to implanted urinary neurostimulation device ✅ Billable
│   │   ├── T83.591A / D / S   Infection/inflammatory reaction due to implanted urinary sphincter ✅ Billable
│   │   ├── T83.592A / D / S   Infection/inflammatory reaction due to indwelling ureteral stent ✅ Billable
│   │   ├── T83.593A / D / S   Infection/inflammatory reaction due to other urinary stent ✅ Billable
│   │   └── T83.598A / D / S   Infection/inflammatory reaction due to other prosthetic device in urinary system ✅ Billable
│   │
└── T83.6   Infection/inflammatory reaction due to prosthetic device, implant and graft in genital tract ❌ Non-billable

Catheter-Specific Code Selection — T83.511A vs. T83.510A vs. T83.518A

The 6th character within T83.51x specifies the type of urinary catheter:

• T83.510A — Cystostomy catheter (suprapubic tube inserted through the abdominal wall directly into the bladder)
• T83.511A — Indwelling urethral catheter (Foley catheter inserted via the urethra) ← This Code
• T83.512A — Nephrostomy catheter (percutaneous tube inserted into the renal pelvis/calyces)
• T83.518A — Other urinary catheter (e.g., external condom catheter with ascending infection, intermittent self-catheterization with associated infection)

The catheter type is determined by the provider’s documentation — never infer the catheter type from clinical context without provider documentation. When the catheter type is unspecified in the provider’s note, query before defaulting.

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✅ Includes

The following clinical terms and scenarios map to T83.511A for the initial encounter (active treatment):

• CAUTI due to indwelling urethral (Foley) catheter — initial encounter
• Infection due to indwelling urinary catheter (when urethral type is confirmed) — initial encounter
• Inflammatory reaction due to Foley catheter — initial encounter
• Foley catheter-associated bladder infection — initial encounter
• Cystitis due to indwelling urethral catheter — initial encounter (assign T83.511A + N39.0 or N30.x)
• Pyelonephritis secondary to indwelling urethral catheter — initial encounter (assign T83.511A + N39.0 or N10)
• Urosepsis/sepsis secondary to indwelling urethral catheter infection — initial encounter (assign A41.x as principal per sepsis guidelines, then T83.511A as the source/etiology code)

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❌ Excludes

Excludes 2 — May Be Coded in Addition if Separately Present

Code	Description	Note
N99.5-	Complications of stoma of urinary tract	Stoma complications at a urinary diversion site are a distinct clinical entity from catheter-associated infection; separately codeable when both conditions coexist
T86.-	Failure and rejection of transplanted organs and tissue	At the T83 category level — transplant rejection is coded under T86.x regardless of whether a catheter is involved; code separately when both conditions are present

Mandatory Additional Code Instruction — "Use Additional Code to Identify Infection"

The T83.5 subcategory carries a tabular “Use additional code” instruction — this is not optional. When T83.511A is assigned, a code identifying the type of infection or causative organism must be assigned as an additional code. Common pairings:

• N39.0 — Urinary tract infection, site not specified (most common)
• N10 — Acute pyelonephritis (when upper tract involvement is documented)
• N30.00 — Acute cystitis without hematuria (when cystitis is documented as the infection type)
• B96.20 — E. coli as the cause of diseases classified elsewhere (when organism is documented)
• B96.1 — Klebsiella pneumoniae (when organism is documented)
• B37.41 — Candidal cystitis (when fungal CAUTI is documented)
• A41.51 — Sepsis due to E. coli (when CAUTI has progressed to sepsis — sequences as principal per ICD-10-CM sepsis guidelines)

Failure to assign the additional infection/organism code is a coding compliance deficiency — audit tools and coding quality software will flag T83.511A assigned alone without an additional organism or infection code.

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📋 Clinical Overview

7th Character Extension Guide for T83.511x

The 7th character for T83.511 determines the phase of care and must be selected based on the clinical context — not just whether it is the patient’s first visit for this condition.

7th Character	Code	Description	When to Use
A	T83.511A	Initial encounter	Any encounter where the patient is receiving active treatment for the CAUTI — antibiotics being prescribed, catheter being managed/replaced, hospitalization for CAUTI. Does NOT mean first visit only.
D	T83.511D	Subsequent encounter	Active treatment is complete; patient presents for follow-up, monitoring, or wound check after the infection has been treated.
S	T83.511S	Sequela	CAUTI has resolved but has left a late effect or residual complication (e.g., urethral stricture, chronic bladder irritation, recurrent UTI pattern attributable to catheter damage). The sequela condition is coded first, then T83.511S as the cause.

"Initial Encounter" Means Active Treatment — Not First Visit

This is the single most common 7th character selection error for T83.511. The A extension applies throughout the entire course of active treatment — if a patient is admitted for CAUTI management with intravenous antibiotics on Day 1 and is still receiving IV antibiotics on Day 5, all inpatient days are coded with the A extension. The D extension applies only after active treatment has concluded and the patient is in a monitoring/follow-up phase. A patient transferred from the ED to an inpatient floor for ongoing CAUTI treatment continues to use A, not D, at every subsequent encounter.

CAUTI Coding Cascade — Multi-Code Sequencing

CAUTI frequently generates a coding cascade of multiple codes that must be assigned together. Understanding the sequencing rules for each clinical scenario is essential:

Clinical Scenario	Principal Diagnosis	Additional Codes	Notes
CAUTI without sepsis, admission for treatment	T83.511A	N39.0 + organism code (B95-B97/B96.x)	T83.511A as principal; infection type and organism mandatory additional codes
CAUTI with sepsis (sepsis is the reason for admission)	A41.x (sepsis by organism)	T83.511A + N39.0 + organism code	Sepsis sequences as principal per ICD-10-CM I.C.1.d; T83.511A is the source/etiology; both required
CAUTI as HAI during admission for another condition	The original admitting diagnosis	[[T83.511A]] + N39.0 + organism code	T83.511A is secondary; POA = “N” if not present on admission → HAC payment reduction applies
CAUTI with AKI	T83.511A or A41.x	N17.x + T83.511A (or as secondary)	AKI is an MCC; elevates to DRG 689 when UTI/T83.511A is principal
Urosepsis due to CAUTI	Per sepsis guidelines → A41.x	T83.511A + N39.0 + organism	Note: “Urosepsis” is NOT a codeable term — provider documentation must specify “sepsis” for sepsis coding per ICD-10-CM guidelines

"Urosepsis" Is Not a Codeable Term

When a provider documents “urosepsis” in the context of CAUTI, the coder cannot automatically assign a sepsis code (A41.x). Per ICD-10-CM Official Guidelines (Section I.C.1.d.1.a), the term “urosepsis” is not indexed as sepsis in ICD-10-CM and defaults to a UTI code without sepsis. A CDI query is required asking the provider to specify whether the patient has sepsis (per Sepsis-3 criteria: infection + organ dysfunction) or a UTI without systemic sepsis. This distinction has enormous DRG weight implications — sepsis DRG 871 (without MCC) has approximately 3x the relative weight of UTI DRG 690.

HAC Status — CAUTI Payment Policy Detail

T83.511A is one of the original CMS Hospital-Acquired Conditions (HACs) — CAUTI has been on the HAC list since the program’s inception under the Deficit Reduction Act of 2005 with payment implications effective October 1, 2008.

HAC Rule Component	Details
HAC Category	Catheter-Associated Urinary Tract Infection (UTI)
Payment Impact (Secondary Dx)	When POA = “N,” CMS does not pay the higher DRG tier that T83.511A as secondary diagnosis would generate
POA Indicator “Y”	Present on admission — full DRG credit awarded as a secondary CC/MCC (if applicable)
POA Indicator “N”	Not present on admission (developed during inpatient stay) — payment reduced to the DRG weight without T83.511A’s contribution
HACRP Penalty	Hospitals in the worst-performing quartile of HAC scores receive a 1% overall Medicare FFS payment reduction for the fiscal year — applies to ALL discharges, not just CAUTI cases
POA Indicator “U” or “W”	Unknown or clinically undetermined — treated as “N” for payment purposes; CDI and nursing documentation must be timely and complete

POA Indicator Accuracy Is a Revenue Integrity Issue

The POA indicator for T83.511A is among the highest-stakes POA documentation decisions in inpatient coding. A POA indicator of “N” on a case where T83.511A is the primary reason for admission would be a significant coding error — T83.511A cannot be “not present on admission” if it is the principal diagnosis. Conversely, assigning POA “Y” to T83.511A when catheter placement and infection both clearly occurred after admission is a compliance risk. Query POA timing documentation proactively: Was the catheter in place prior to admission? Were CAUTI symptoms present prior to admission? The answers drive the POA indicator.

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💰 HCC Risk Adjustment (CMS-HCC v28)

Field	Detail
CMS-HCC Model Version	v28 (Fully operative — Payment Year 2026)
HCC Assignment	❌ Not HCC-Mapped
HCC Category	N/A
RAF Coefficient	N/A — $0.00 risk adjustment contribution

T83.511A does not map to an HCC under CMS-HCC v28. Acute device-complication infection codes without a chronic condition component are generally not modeled in the HCC architecture.

HCC Capture Through Associated Conditions

While T83.511A itself carries no HCC weight, the clinical context surrounding CAUTI frequently involves HCC-mapped comorbidities that must be captured at every qualifying encounter:

• A41.x — Sepsis (if CAUTI progresses to sepsis) → HCC 2 (~0.413 RAF coefficient)
• E11.649 — Type 2 diabetes with urological complications → HCC 37 (~0.302 RAF)
• N18.30 / N18.4 / N18.5 — Chronic kidney disease, stages 3-5 → HCC 137-138 (~0.179-0.289 RAF)
• G82.21 — Paraplegia (neurogenic bladder driving catheter dependence) → HCC 72 (~0.394 RAF)
• N31.9 — Neuromuscular dysfunction of bladder → HCC-relevant when mapped with underlying neurological cause

Patients who are catheter-dependent often have multiple HCC-generating comorbidities — every inpatient and outpatient encounter for CAUTI management is a HCC recapture opportunity for these underlying chronic conditions.

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🏥 MS-DRG Assignment

MDC 11 — Diseases and Disorders of the Kidney and Urinary Tract (when T83.511A is principal)

DRG	Title	Est. Relative Weight*
DRG 689	Kidney and Urinary Tract Infections with MCC	~1.3-1.7
DRG 690	Kidney and Urinary Tract Infections without MCC	~0.7-0.9

Approximate. Verify against IPPS FY2026 Final Rule tables (CMS v43 MS-DRG Definitions Manual). Confirm with your facility’s DRG grouper software.

Two-Tier DRG Split — Only MCC Elevates; CC Does Not

A critical MDC 11 nuance: the Kidney and Urinary Tract Infections DRG family uses a two-tier split (MCC vs. no-MCC) rather than the three-tier MCC/CC/no-CC-MCC structure seen in many other MDCs. This means a secondary CC-level diagnosis does not independently elevate the DRG from 690 to 689 — only an MCC-level secondary diagnosis achieves that elevation. Common MCCs associated with CAUTI admissions include:

• N17.0 — Acute kidney injury with tubular necrosis (MCC)
• J69.0 — Acute respiratory failure, unspecified whether with hypoxia or hypercapnia (MCC)
• E43 — Unspecified severe protein-calorie malnutrition (MCC)
• A41.x — Sepsis (MCC — but when sepsis is present, it usually sequences as the principal diagnosis and the entire DRG family changes)

When CAUTI is the principal diagnosis and the only secondary diagnoses are CC-level, the case groups to DRG 690 regardless of how many CCs are present. This makes MCC documentation and CDI query for AKI, respiratory failure, and malnutrition especially high-value for CAUTI admissions.

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🔗 Related ICD-10-CM Codes

T83.511 Encounter Variants

Code	Description
T83.511A	Infection/inflammatory reaction due to indwelling urethral catheter, initial encounter ← This Code
T83.511D	Infection/inflammatory reaction due to indwelling urethral catheter, subsequent encounter
T83.511S	Infection/inflammatory reaction due to indwelling urethral catheter, sequela

T83.51x Sibling Codes — Catheter Type Variants

Code	Description
T83.510A	Infection/inflammatory reaction due to cystostomy catheter, initial encounter
T83.511A	Infection/inflammatory reaction due to indwelling urethral catheter, initial encounter ← This Code
T83.512A	Infection/inflammatory reaction due to nephrostomy catheter, initial encounter
T83.518A	Infection/inflammatory reaction due to other urinary catheter, initial encounter

Mandatory Additional Codes — Infection and Organism

Code	Description
N39.0	Urinary tract infection, site not specified (most common additional code)
N10	Acute pyelonephritis (when upper tract involvement is documented)
N30.00	Acute cystitis without hematuria
B96.20	Escherichia coli as cause of diseases classified elsewhere
B96.1	Klebsiella pneumoniae as cause of diseases classified elsewhere
B96.89	Other specified bacteria as cause of diseases classified elsewhere
B37.41	Candidal cystitis (fungal CAUTI)

Sepsis Codes When CAUTI Progresses to Systemic Infection

Code	Description
A41.51	Sepsis due to Escherichia coli
A41.01	Sepsis due to methicillin-susceptible Staphylococcus aureus
A41.3	Sepsis due to Hemophilus influenzae
A41.59	Other Gram-negative sepsis
A41.9	Sepsis, unspecified organism

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🛠️ Commonly Associated CPT Codes (Urology / Infectious Disease / ED)

Outpatient and Profee Setting Context

T83.511A supports urology and infectious disease E/M services, catheter exchange procedures, and diagnostic studies in both outpatient and inpatient settings. In the ED setting, CAUTI evaluation commonly generates a high-complexity E/M with diagnostic labs and often an observation or inpatient admission order. In the urology outpatient setting, catheter removal/exchange is the primary procedure associated with this diagnosis.

CPT Code	Description	Profee Coding Notes
99214 / 99215	Office or other outpatient visit, established patient, moderate/high complexity	Urology or ID E/M for CAUTI management; high complexity typically justified by prescription of antibiotics, lab result interpretation, and catheter management decision-making
99285	Emergency department E/M, high complexity	ED evaluation of CAUTI presenting with fever, systemic signs, or suspected sepsis; modifier -25 for separately identifiable E/M when procedure also performed same date
51701	Insertion of non-indwelling bladder catheter	Temporary catheter for drainage during CAUTI treatment — distinct from indwelling Foley exchange
51702	Insertion of temporary indwelling bladder catheter; simple	Simple catheter replacement after removal of infected catheter
51703	Insertion of temporary indwelling bladder catheter; complicated	Complicated catheter exchange (stricture, difficult anatomy, fluoroscopic guidance)
52000	Cystourethroscopy	When cystoscopy is performed to evaluate bladder involvement, urethral injury, or retained catheter material — medical necessity must be documented
87086	Culture, bacterial; quantitative urine	Urine culture order supporting CAUTI diagnosis — separately billable laboratory code; does not bundle with E/M
87088	Culture, bacterial; quantitative urine, each isolate	Each bacterial isolate from urine culture — separately billable; used when multiple organisms are isolated
87184	Susceptibility studies; disk method (per plate)	Antibiotic susceptibility testing on CAUTI isolate — supports antibiotic selection documentation

NCCI Bundling Considerations

• 51702 (simple catheter insertion) is generally bundled into an E/M when performed in the office setting as part of the evaluation — document separately if it constitutes a distinct and separately identifiable procedure with additional time and resources beyond the standard E/M.
• 52000 (cystoscopy) has a global period of 0 days — modifier -25 is not required for same-day E/M with cystoscopy in most payer policies, but the E/M must document a separate and identifiable problem beyond the pre/post-procedure assessment.

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🔬 ICD-10-PCS Crosswalk (Inpatient Procedures)

When T83.511A is an inpatient diagnosis, these PCS codes are relevant for associated catheter management and urologic procedures.

PCS Section	Body System	Root Operation	Clinical Application
0 (Medical and Surgical)	T (Urinary System)	P (Removal)	Catheter removal — 0TPB70Z: Removal of Drainage Device from Bladder, Via Natural or Artificial Opening
0 (Medical and Surgical)	T (Urinary System)	W (Revision)	Catheter replacement/exchange — 0TWB70Z: Revision of Drainage Device in Bladder, Via Natural or Artificial Opening
0 (Medical and Surgical)	T (Urinary System)	9 (Drainage)	Bladder drainage (repositioning/re-catheterization) — 0T9B70Z: Drainage of Bladder, Via Natural or Artificial Opening
3 (Administration)	E (Physiological Systems)	1 (Irrigation)	Bladder irrigation with antimicrobial agent — 3E1L8GC: Introduction of Other Therapeutic Substance into Urinary Tract, Via Natural or Artificial Opening Endoscopic
0 (Medical and Surgical)	T (Urinary System)	B (Excision)	Cystoscopy with biopsy for suspected bladder wall involvement — 0TBB8ZX: Excision of Bladder, Via Natural or Artificial Opening Endoscopic, Diagnostic

PCS Character Analysis — 0TPB70Z

Position	Character	Value	Definition
1	Section	0	Medical and Surgical
2	Body System	T	Urinary System
3	Root Operation	P	Removal (taking out or off a device from a body part) — used for catheter removal
4	Body Part	B	Bladder
5	Approach	7	Via Natural or Artificial Opening (transurethral removal of Foley catheter)
6	Device	0	Drainage Device (the catheter is a drainage device in PCS nomenclature)
7	Qualifier	Z	No Qualifier

PCS Root Operation: Removal (P) vs. Revision (W) vs. Replacement (R)

• Use Removal (P) when the catheter is taken out and not immediately replaced — e.g., catheter is discontinued as part of CAUTI treatment
• Use Revision (W) when the catheter is exchanged (old catheter out, new catheter in) — this is a single code, not a Removal + Insertion pair; Revision captures the exchange as one operation
• Note: There is no ICD-10-PCS “Replacement” root operation for urinary drainage devices — catheter exchange is Revision, not Replacement (Replacement is reserved for body parts, not devices)

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💊 Coding Scenarios and Examples

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Scenario 1 — Inpatient Admission: CAUTI as Principal Diagnosis with AKI

Clinical Vignette: A 74-year-old male nursing home resident with a chronic indwelling Foley catheter (placed for benign prostatic hyperplasia — BPH) is transferred to the acute care hospital with fever (38.9°C), costovertebral angle tenderness, and urinalysis showing >100,000 CFU/mL E. coli. Creatinine is elevated at 2.9 mg/dL from a baseline of 1.1, consistent with acute kidney injury. The admitting physician documents: “CAUTI due to indwelling urethral catheter — E. coli pyelonephritis. Acute kidney injury, prerenal component. Foley catheter replaced; IV ceftriaxone initiated.”

Principal Diagnosis:

• T83.511A — Infection and inflammatory reaction due to indwelling urethral catheter, initial encounter (primary reason for admission)

Secondary Diagnoses:

• N10 — Acute pyelonephritis (upper tract infection documented — mandatory additional “Use additional code to identify infection” instruction)
• B96.20 — E. coli as cause of diseases classified elsewhere (documented organism)
• N17.0 — Acute kidney injury with tubular necrosis (MCC — documented AKI; elevates to DRG 689)
• N40.1 — Benign prostatic hyperplasia with lower urinary tract symptoms (underlying condition requiring catheter)

MS-DRG Assignment: T83.511A as principal + N17.0 as MCC secondary → DRG 689 (Kidney and Urinary Tract Infections with MCC)

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Scenario 2 — Sepsis Sequencing: CAUTI Progresses to Gram-Negative Sepsis

Clinical Vignette: A 68-year-old female with T10 complete spinal cord injury (neurogenic bladder) and an indwelling urethral catheter presents to the ED with hypotension (BP 88/52), tachycardia (HR 118), altered mental status, and fever. Blood cultures are drawn and later return positive for Klebsiella pneumoniae. Urine culture also grows Klebsiella pneumoniae >100,000 CFU/mL. The ED attending documents: “Sepsis due to Klebsiella pneumoniae — source identified as CAUTI from indwelling Foley catheter. Septic shock present.” Patient is admitted to ICU.

Principal Diagnosis:

• A41.59 — Other Gram-negative sepsis (Klebsiella is Gram-negative; sequences as principal per ICD-10-CM sepsis guidelines I.C.1.d — sepsis is the reason for admission)

Secondary Diagnoses:

• R65.21 — Severe sepsis with septic shock (documented septic shock — MCC)
• T83.511A — Infection and inflammatory reaction due to indwelling urethral catheter, initial encounter (source of sepsis — mandatory additional code)
• N39.0 — Urinary tract infection, site not specified (mandatory “Use additional code to identify infection” instruction)
• B96.1 — Klebsiella pneumoniae as cause of diseases classified elsewhere (documented organism)
• G82.51 — Quadriplegia, C1-C4 complete (or appropriate paraplegia/quadriplegia level; underlying reason for catheter dependence)

Note

When sepsis is the reason for admission, it sequences as principal — T83.511A moves to secondary as the infection source. This is the fundamental CAUTI-to-sepsis sequencing rule and the most common sequencing error in CAUTI cases.

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Scenario 3 — POA and HAC Scenario: CAUTI Develops During Orthopedic Admission

Clinical Vignette: A 71-year-old female is admitted for elective right total hip arthroplasty (THA). An indwelling urethral catheter is placed intraoperatively. On post-operative Day 3, the patient develops dysuria, foul-smelling urine, and fever of 38.4°C. Urinalysis and culture confirm CAUTI with E. coli. The orthopedic surgeon documents: “CAUTI — catheter placed intraoperatively. E. coli UTI. IV antibiotics initiated. Foley catheter removed.” The CAUTI was not present on admission.

Principal Diagnosis:

• Z96.641 — Presence of right artificial hip joint (or appropriate primary procedure code for THA — the admission was for THA)
• (Intraoperatively: THA procedure codes would be the operative codes driving DRG assignment)

Secondary Diagnoses:

• T83.511A — POA indicator: “N” (CAUTI developed post-operatively; NOT present on admission)
• N39.0 — Urinary tract infection, site not specified
• B96.20 — E. coli as cause of diseases classified elsewhere

HAC Impact: T83.511A with POA = “N” activates the HAC payment policy — CMS will not pay the additional DRG weight that T83.511A as a secondary diagnosis would otherwise generate. The hospital bears the cost of treating this preventable HAI without additional reimbursement for the complication. This case would also contribute to the hospital’s NHSN CAUTI surveillance rate.

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⚠️ Coding Pitfalls and Tips

	Pitfall or Tip
❌	Omitting the mandatory additional code. The T83.5 category carries a “Use additional code to identify infection” instruction that is non-optional. Submitting T83.511A alone, without N39.0 or an organism code (B95-B97, B96.x), is a coding compliance deficiency. Auditors and coding quality software will flag this as an incomplete code assignment. At minimum, N39.0 must accompany T83.511A at every assignment.
❌	Coding “urosepsis” as sepsis without physician confirmation. The term “urosepsis” in the medical record does NOT automatically authorize assignment of a sepsis code (A41.x). Per ICD-10-CM guidelines, “urosepsis” is not indexed as sepsis — it defaults to UTI coding. A CDI query must confirm whether the provider means sepsis by Sepsis-3 criteria (infection + acute organ dysfunction). This is the most financially impactful CAUTI-related coding error because sepsis DRG 871 has approximately 3x the relative weight of UTI DRG 690.
❌	Incorrectly assigning the 7th character. Assigning T83.511D (subsequent encounter) when the patient is still actively being treated is a 7th character selection error. The “A” extension applies throughout the entire active treatment course — including every hospital day, every outpatient infusion visit, and every office visit at which antibiotics are being managed.
❌	Assigning T83.511A as “Present on Admission” (Y) when catheter was placed after admission. When a catheter is placed post-admission and CAUTI develops in-house, POA = “N” is the accurate indicator — assigning POA “Y” constitutes a POA documentation falsification and potential revenue integrity violation.
✅	Always query for specific catheter type. When the provider’s note says “urinary catheter infection” or “Foley catheter infection” without specifying whether it is urethral, suprapubic (cystostomy), or nephrostomy, confirm the catheter type before code assignment. The T83.51x code set has distinct codes for each type — defaulting to T83.511A when the catheter type is actually a suprapubic/cystostomy tube (T83.510A) is a specificity error.
✅	Query for sepsis when systemic signs are documented alongside CAUTI. Systemic signs (hypotension, tachycardia, altered mental status, new organ dysfunction) in the context of CAUTI should prompt a CDI query for sepsis. Confirmed sepsis changes the entire DRG family (from UTI DRG 690 at ~0.8 relative weight to Sepsis DRG 871 at ~1.8+ relative weight) and changes the sequencing (sepsis as principal, CAUTI as etiology).
✅	Capture all catheter-dependent comorbidities at every encounter. Patients requiring long-term indwelling catheterization typically have HCC-generating underlying conditions — spinal cord injury (G82.x), neurogenic bladder (N31.9), BPH (N40.1), MS (G35.D), or diabetes (E11.x). Code all documented conditions at every qualifying encounter to ensure accurate HCC recapture and clinical complexity documentation.

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📚 Sources

¹ CMS/NCHS. ICD-10-CM Official Guidelines for Coding and Reporting, FY2026. Section I.C.19.a (7th character application — initial encounter, subsequent encounter, sequela); Section I.C.1.d (Sepsis sequencing guidelines — urosepsis not coded as sepsis); Section I.C.19 (Complications of surgical and medical care — T codes).

² CMS. IPPS Final Rule FY2026 — MS-DRG Definitions Manual v43. MDC 11 Kidney and Urinary Tract, DRG 689/690 (Kidney and Urinary Tract Infections with/without MCC). https://www.cms.gov/icd10m/FY2026-fr-v43-fullcode-cms/fullcode_cms/P0014.html

³ AAPC. “ICD-10-CM Code for Infection and Inflammatory Reaction Due to Indwelling Urethral Catheter, Initial Encounter — T83.511A.” Full descriptor, Excludes2, and Use additional code notation confirmed. https://www.aapc.com/codes/icd-10-codes/T83.511A

⁴ icdlist.com. “2026 ICD-10-CM Diagnosis Code T83.511A.” Billability confirmed; 7th character usage guidance; code hierarchy. https://icdlist.com/icd-10/T83.511A

⁵ MBW Revenue Cycle Management. “ICD-10 Code for UTI: Guide to Catheter-Associated Infections.” (2024). T83.511A vs. T83.511D encounter selection; NHSN CAUTI rate data (3.1-7.5 per 1,000 catheter-days). https://www.mbwrcm.com/the-revenue-cycle-blog/icd-10-uti-coding-for-catheter-associated-infections

⁶ Annex Med. “ICD-10-CM Coding for Catheter-Associated Urinary Tract Infection (CAUTI).” (2024). T83.511A code history (effective FY2017), complication sequencing guidance. https://annexmed.com/icd-10-cm-coding-for-catheter-associated-infections-cauti

⁷ Health Information Associates (HIA Code). “Sequencing the Diagnosis of Sepsis.” (2024). Sepsis sequencing with T83.511A as source of infection; urosepsis coding guidance. https://hiacode.com/blog/education/sepsis-series-sequencing-the-diagnosis-of-sepsis

⁸ CMS. Hospital-Acquired Conditions (HAC) Payment Policy. CAUTI listed as an official HAC since October 1, 2008; payment implications for POA = “N.” https://www.cms.gov/medicare/payment/fee-for-service-providers/hospital-aquired-conditions-hac

⁹ CMS. Hospital-Acquired Condition Reduction Program (HACRP). 1% Medicare payment reduction for hospitals in the worst-performing quartile of HAC scores. https://www.cms.gov/medicare/payment/prospective-payment-systems/acute-inpatient-pps/hospital-acquired-condition-reduction-program

¹⁰ CDC. “Catheter-Associated Urinary Tract Infection (CAUTI) Basics.” Clinical criteria for CAUTI diagnosis; NHSN surveillance definitions. https://www.cdc.gov/uti/about/cauti-basics.html

¹¹ MM Plus Inc. “Inpatient FAQ: UTI and Indwelling Catheter/Device — Knowledge Base.” (2024). Principal diagnosis sequencing when CAUTI drives admission. https://www.mmplusinc.com/kb-articles/inpatient-faq-uti-and-indwelling-catheter-device

¹² FindACode. “DRG MDC 11 — Diseases and Disorders of the Kidney and Urinary Tract.” DRG 689/690 medical DRG listing confirmed. https://www.findacode.com/code-set.php?set=DRG&mdc=11

¹³ AMA. CPT Professional Edition 2026. Urology subsection — 51701, 51702, 51703, 52000; laboratory section — 87086, 87088, 87184.

¹⁴ Pinson, R., Tang, C. CDI Pocket Guide. CDI Plus, 2024. HAC POA policy; CAUTI-to-sepsis CDI query guidance; DRG two-tier structure for MDC 11.