R65.20

⚕️ICD-10-CM R65.20: Severe Sepsis without Septic Shock

📋 Code Information

Field	Value
ICD-10-CM Code	R65.20
Descriptor	Severe sepsis without septic shock
Billable Status	✅ Billable/Specific Code
Effective Date	October 1, 2025 (2026 edition)
Implementation Date	October 1, 2015
Last Updated	October 1, 2025 (no change from 2025 edition)
Chapter	Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
Block	General symptoms and signs (R50-R69)
Parent Category	R65.2- - Severe sepsis

📖 Clinical Description

R65.20 represents a diagnosis of severe sepsis where the patient has sepsis (infection with systemic inflammatory response syndrome) accompanied by acute organ dysfunction, but has not developed septic shock. Septic shock is characterized by persistent hypotension requiring vasopressors to maintain mean arterial pressure and elevated lactate levels despite adequate fluid resuscitation.^[10]

Diagnostic Criteria^[10]

For accurate assignment of R65.20, the following four criteria must be met:

1. Confirmed Infection: Documented or clinically suspected infection identified through laboratory tests, imaging studies, or clinical evaluation.

2. Systemic Inflammatory Response Syndrome (SIRS) Criteria: At least two of the following:

   • Temperature >38°C (100.4°F) or <36°C (96.8°F)
   • Heart rate >90 beats per minute
   • Respiratory rate >20 breaths/minute or PaCO2 <32 mm Hg
   • WBC >12,000/mm³, <4,000/mm³, or >10% immature (band) forms

3. Organ Dysfunction: Evidence must be present, which can include:

   • Altered mental status or confusion
   • Hypoxemia (low oxygen saturation)
   • Elevated serum lactate levels
   • Acute kidney injury (increased creatinine or decreased urine output)
   • Coagulation abnormalities (thrombocytopenia)
   • Liver dysfunction (elevated bilirubin)

4. Absence of Septic Shock: No persistent hypotension requiring vasopressors or elevated lactate >2 mmol/L despite fluid resuscitation.

🔍 Includes and Inclusions

This code explicitly includes the following:^[1][3][4][5]

Inclusion Term	Description
Severe sepsis NOS	Severe sepsis, not otherwise specified
Infection with associated acute organ dysfunction	Any infection accompanied by acute organ dysfunction
Sepsis with acute organ dysfunction	Sepsis with documented organ failure
Sepsis with multiple organ dysfunction	Sepsis affecting two or more organ systems

🚫 Excludes and Coding Instructions

Type 1 Excludes^[1][8]

Code	Condition	Notes
T81.12-	Postprocedural septic shock	Use for septic shock following a procedure

Important Coding Instructions^[4][7]

Code First

The underlying infection must be sequenced first, followed by R65.20. Examples include:

• A41.9 - Sepsis, unspecified organism
• T81.44- - Sepsis following a procedure
• O85 - Puerperal sepsis
• O03.87 - Sepsis following complete or unspecified spontaneous abortion
• O08.82 - Sepsis following ectopic and molar pregnancy

Use Additional Code

Additional codes must be used to identify the specific acute organ dysfunction, such as:

• N17- - Acute kidney failure
• J96.0- - Acute respiratory failure
• G72.81 - Critical illness myopathy
• G62.81 - Critical illness polyneuropathy
• D65 - Disseminated intravascular coagulopathy [DIC]
• G93.41 - Encephalopathy (metabolic) (septic)
• K72.0- - Hepatic failure

📊 Code Tree and Hierarchy

flowchart TD
    A["R00-R99 Symptoms, signs and abnormal findings"] --> B["R50-R69 General symptoms and signs"]
    B --> C["R65 Symptoms and signs specifically associated<br>with systemic inflammation and infection"]
    C --> D["R65.1 SIRS of non-infectious origin"]
    D --> E["R65.10 …… without acute organ dysfunction"]
    D --> F["R65.11 …… with acute organ dysfunction"]
    C --> G["R65.2 Severe sepsis"]
    G --> H["R65.20 SEVERE SEPSIS WITHOUT SEPTIC SHOCK"]
    G --> I["R65.21 Severe sepsis with septic shock"]

Adjacent Codes^[1][3]

Code	Description
R65.10	Systemic inflammatory response syndrome (SIRS) of non-infectious origin without acute organ dysfunction
R65.11	Systemic inflammatory response syndrome (SIRS) of non-infectious origin with acute organ dysfunction
R65.20	Severe sepsis without septic shock
R65.21	Severe sepsis with septic shock

📝 Official Coding Guidelines^[7]

Section I.C.1.d.1: Coding of Sepsis and Severe Sepsis

Sepsis: For a diagnosis of sepsis, assign the appropriate code for the underlying systemic infection. If the type of infection or causal organism is not further specified, assign code A41.9, Sepsis, unspecified organism.

A code from subcategory R65.2-, Severe sepsis, should not be assigned unless severe sepsis or an associated acute organ dysfunction is documented.

Section I.C.1.d.1.b: Severe Sepsis

The coding of severe sepsis requires a minimum of 2 codes:

1. First, a code for the underlying systemic infection
2. Followed by a code from subcategory R65.2-, Severe sepsis
3. Additional code(s) for the associated acute organ dysfunction are also required

If the causal organism is not documented, assign code A41.9, Sepsis, unspecified organism, for the infection.

Section I.C.1.d.3: Sequencing of Severe Sepsis

• If severe sepsis is present on admission and meets the definition of principal diagnosis, the underlying systemic infection should be assigned as principal diagnosis followed by the appropriate code from subcategory R65.2.
• A code from subcategory R65.2 can never be assigned as a principal diagnosis.
• When severe sepsis develops during an encounter (not present on admission), the underlying systemic infection and the appropriate code from subcategory R65.2 should be assigned as secondary diagnoses.

🏥 HCC (Hierarchical Condition Category) Information

HCC Mapping (CMS-HCC Model V28/V24)

Factor	Value
HCC Status	✅ Maps to HCC payment model
CMS-HCC V24 Category	HCC 34 (Sepsis and Other Infections)
CMS-HCC V28 Category	HCC 34 (Sepsis and Other Infections)
RAF Score Contribution	Varies based on model year and coefficients

Risk Adjustment Significance^[2][6][9]

R65.20 is a significant risk adjuster in Medicare Advantage and other value-based reimbursement models. Sepsis and severe sepsis are high-cost conditions that substantially impact expected healthcare utilization and costs.

Key Risk Adjustment Concepts^[6][9]

• MEAT Criteria: Documentation must demonstrate the condition is being Monitored, Evaluated, Assessed/Addressed, or Treated during the encounter.
• Annual Recapture: Chronic conditions (including sequelae of severe sepsis) must be documented each calendar year to maintain HCC eligibility.
• RADV Audit Defense: Documentation must meet MEAT standards to withstand Risk Adjustment Data Validation (RADV) audits.

V28 Model Considerations^[6]

The CMS-HCC model V28 (implemented with phase-in beginning 2024) introduced changes that may affect the RAF contribution of sepsis codes:

• Reconfigured HCC groupings
• Updated coefficients reflecting current cost data
• Constraining in some disease families

Always verify current RAF coefficients using official CMS V28 mapping files and the most recent Rate Announcement.

💰 MS-DRG Assignment^[1][3]

When R65.20 is assigned for inpatient admissions, it maps to the following Medicare Severity-Diagnosis Related Groups (MS-DRGs):

MS-DRG	Description
870	Septicemia or severe sepsis with mechanical ventilation >96 hours
871	Septicemia or severe sepsis without mechanical ventilation >96 hours with MCC
872	Septicemia or severe sepsis without mechanical ventilation >96 hours without MCC

Note: MCC = Major Complication/Comorbidity

🔗 Associated CPT Codes^[10]

Common CPT codes associated with evaluation and management of severe sepsis:

CPT Code	Description
99291	Critical care, first 30-74 minutes
99292	Critical care, each additional 30 minutes
36415	Collection of venous blood by venipuncture
87040	Blood culture, aerobic, with isolation and presumptive identification
87070	Culture, bacterial; any other source except urine, blood or stool
80053	Comprehensive metabolic panel
80076	Hepatic function panel
85025	Complete blood count (CBC) with differential
85610	Prothrombin time

📋 Documentation Requirements^[7][9][10]

To support the use of R65.20, clinical documentation must include:

• Underlying infection: Clearly documented source and organism (if known)
• SIRS criteria: At least two criteria met and documented
• Organ dysfunction: Specific organ affected and clinical evidence of dysfunction
• Absence of septic shock: Documentation that shock is not present
• MEAT criteria: At least one of Monitor, Evaluate, Assess/Address, or Treat documented

🔍 ICD-9 Crosswalk^[3]

ICD-9-CM Code	Description	Mapping Type
995.92	Severe sepsis	Approximate/GEM

📅 Code History^[1]

Year	Effective Date	Change
2016	October 1, 2015	New code (first year of non-draft ICD-10-CM)
2017-2025	October 1, 2016 - 2024	No change
2026	October 1, 2025	No change from 2025 edition

🧩 Coding Examples and Scenarios

Example 1: Severe Sepsis Present on Admission

Scenario: A 72-year-old patient is admitted with fever, tachycardia, and tachypnea. Urinalysis confirms urinary tract infection. Labs show elevated creatinine (acute kidney injury) and WBC 18,000. Blood pressure responds to fluids; no vasopressors required. Physician documents “severe sepsis due to UTI with acute kidney injury.” Coding:

• N39.0 (Urinary tract infection, site not specified) [underlying infection]
• R65.20 (Severe sepsis without septic shock)
• N17.9 (Acute kidney failure, unspecified) [acute organ dysfunction]
• Rationale: Underlying infection sequenced first, followed by severe sepsis code and specific organ dysfunction code.^[4][7]

Example 2: Sepsis with Organ Dysfunction Developing After Admission

Scenario: A patient admitted with pneumonia (present on admission) develops acute respiratory failure requiring intubation on hospital day 3. The physician documents “severe sepsis with acute respiratory failure.” Coding:

• J15.9 (Unspecified bacterial pneumonia) [principal diagnosis - present on admission]
• R65.20 (Severe sepsis without septic shock) [secondary - developed after admission]
• J96.01 (Acute respiratory failure with hypoxia) [acute organ dysfunction]
• Rationale: The localized infection (pneumonia) was present on admission and is sequenced first. Severe sepsis developed later and is sequenced secondarily.^[7]

Example 3: Incorrect Sequencing

Scenario: Patient admitted with severe sepsis. Coder assigns R65.20 as principal diagnosis. Coding:

• Incorrect: R65.20 (Severe sepsis without septic shock) as principal
• Correct: Underlying infection code first (e.g., A41.9), then R65.20
• Rationale: Official coding guidelines state that a code from subcategory R65.2 can never be assigned as a principal diagnosis.^[4][7]

Example 4: Severe Sepsis with Multiple Organ Dysfunction

Scenario: Patient with severe sepsis due to streptococcal septicemia presents with acute kidney injury, acute respiratory failure, and DIC. No septic shock. Coding:

• A40.9 (Streptococcal sepsis, unspecified)
• R65.20 (Severe sepsis without septic shock)
• N17.9 (Acute kidney failure, unspecified)
• J96.01 (Acute respiratory failure with hypoxia)
• D65 (Disseminated intravascular coagulopathy [DIC])
• Rationale: All specific organ dysfunctions are coded separately in addition to the severe sepsis code.^[4][7]

References

¹ ICD10Data.com. “2026 ICD-10-CM Diagnosis Code R65.20 - Severe sepsis without septic shock.” ² Optum. “2026 Risk Adjustment Coding and HCC Guide.” ³ EmedCodes.com. “R65.20 - Severe sepsis without septic shock.” ⁴ AAPC. “ICD-10 Code for Severe sepsis without septic shock - R65.20.” ⁵ ICD10ALL.com. “R65.20 - Severe sepsis without septic shock.” ⁶ Health Data Max. “Risk Adjustment Explained: A Practical Guide to HCC, RAS, and Manual Risk Scoring (V28).” (2026) ⁷ AHA Coding Clinic. “ICD-10-CM Official Documentation Guidelines - Section I.C.1.d: Sepsis, Severe Sepsis, and Septic Shock.” (2025) ⁸ ICD10Data.com. “Search Results: septicemia.” ⁹ RAAPID Inc. “Risk Adjustment Coding in 2026: Complete HCC Guide.” ¹⁰ MD Clarity. “ICD Code R65.20: What It Is & When to Use.”