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N40.1

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ICD-10-CM N40.1: Benign prostatic hyperplasia with lower urinary tract symptoms

Quick reference

ElementDetails
CodeN40.1
Official titleBenign prostatic hyperplasia with lower urinary tract symptoms
When to useUse when BPH is documented and the patient has associated lower urinary tract symptoms (LUTS).
Key instructionN40.1 has an instructional note to use an additional code for associated symptoms, when specified.
Don’t confuse withN40.0 (BPH without LUTS), N40.2 (nodular prostate without LUTS), N40.3 (nodular prostate with LUTS).

Short definition

N40.1 is assigned when benign prostatic hyperplasia (BPH) is present with lower urinary tract symptoms (LUTS) such as urinary urgency, frequency, nocturia, weak stream, incomplete emptying, or straining (when documented).

Long definition (clinical meaning)

N40.1 describes non-malignant enlargement/hypertrophy of the prostate that is clinically significant because it is accompanied by LUTS, reflecting functional urinary symptoms rather than an incidental/asymptomatic enlarged prostate.
Within category N40, “includes” terms commonly used interchangeably with BPH such as benign prostatic hypertrophy, enlarged prostate, and nodular prostate.

Coding rules & notes (high-yield)

“Use additional code” expectation

Tabular guidance for N40.1 indicates to add a separate symptom code when LUTS are specified in the note (e.g., urgency), with N40.1 sequenced before the symptom code when N40.1 is the primary diagnosis.

Common LUTS symptom codes to pair (examples)

Use the symptom code(s) that match what the provider documents (not a “kitchen sink” list):

  • R39.14 Feeling of incomplete bladder emptying
  • R35.1 nocturia
  • R39.16 Straining on urination
  • R35.0 Urinary frequency (when documented)
  • R39.15 Urgency of urination (when documented)

(If the note documents urinary retention, weak stream, hesitancy, etc., select the correct ICD-10-CM symptom/retention code(s) supported by documentation and payer policy.)

Includes / Excludes (accuracy checks)

Includes (within N40 category)

N40 category “includes” terms such as adenofibromatous hypertrophy of prostate, benign hypertrophy of the prostate, BPH, enlarged prostate, nodular prostate, and polyp of prostate.

Excludes

  • Excludes1: benign neoplasms of prostate (e.g., adenoma, benign; fibroma; myoma) → D29.1.
  • Excludes2: malignant neoplasm of prostate → C61.
  • N40.0 Benign prostatic hyperplasia without lower urinary tract symptoms.
  • N40.2 Nodular prostate without lower urinary tract symptoms.
  • N40.3 Nodular prostate with lower urinary tract symptoms.
  • Consider prostatitis/inflammatory prostate codes (e.g., N41.-) when the provider’s diagnosis is prostatitis rather than BPH.

LCD/NCD & Medicare-use context (brief)

N40.1 appears in CMS Medicare Coverage Database billing/coding context for certain BPH therapies (example: an article addressing coverage/billing for a “fluid jet system” treatment of BPH lists N40.1 among diagnoses considered in medical-necessity determinations).
In practice, whether N40.1 “supports medical necessity” depends on the service being billed (e.g., meds, office visits, cystoscopy, BPH procedures) and the applicable MAC LCD/article or commercial medical policy for that service.

Documentation tips (to support N40.1 cleanly)

  • Ensure the provider documents BPH and explicitly states at least one LUTS (or describes symptoms clearly enough to code them).
  • Add the specific LUTS symptom codes when documented, consistent with N40.1’s “use additional code” note.
  • If the enlarged prostate is documented without LUTS, use a non-LUTS code such as N40.0 instead of N40.1.

From NotebookLM:

Here is a detailed guide note for N40.1, formatted as clean text for your reference.

N40.1: Benign Prostatic Hyperplasia with Lower Urinary Tract Symptoms (LUTS)

Description

  • Definition: Enlargement of the prostate gland (BPH) that causes functional urinary problems or obstruction.
  • Includes: Enlarged prostate with LUTS, urinary obstruction due to BPH.
  • Differentiation: Use N40.1 when symptoms are present. Use N40.0 only if the prostate is enlarged but the patient has no urinary symptoms (asymptomatic).

Risk Adjustment (HCC) Status

  • HCC Weight: No.
  • Clinical Note: Benign prostatic hyperplasia generally does not map to a Hierarchical Condition Category (HCC) for Medicare risk adjustment. It is considered a chronic condition but does not trigger a risk score increase on its own.

Coding Requirements: The “Use Additional Code” Rule When assigning N40.1, ICD-10 guidelines require you to use an additional code to identify the specific associated symptoms. Common pairs include:

  • R33.8: Urinary retention (Retention of urine).
  • R35.0: Frequency of micturition.
  • R35.1: Nocturia.
  • R39.11: Hesitancy of micturition.
  • R39.12: Poor/weak urinary stream.
  • R39.14: Feeling of incomplete bladder emptying.
  • R39.15: Urgency of urination.
  • R39.16: Straining to void.
  • N13.8: Urinary obstruction (if causing hydronephrosis/obstruction).

Common Associated CPT Codes

1. Diagnostic Workup

  • 51798: Measurement of post-void residual (PVR) urine volume by ultrasound.
  • 51741: Complex uroflowmetry (measuring flow rate).
  • 52000: Cystourethroscopy (diagnostic).
  • 55700: Biopsy of prostate (if PSA is elevated or nodules found).

2. Surgical Interventions

  • 52601: Transurethral resection of prostate (TURP).
    • Note: This is the standard “gold standard” code.
  • 52648: Laser vaporization of prostate (e.g., GreenLight Laser).
  • 52441 / 52442: Insertion of prostatic urethral lift implants (e.g., UroLift).
  • 53854: Transurethral destruction of prostate tissue by radiofrequency water vapor (e.g., Rezum).
  • 0421T: Transurethral waterjet ablation (Aquablation) - Category III code, check payer policy.

Compliance & Bundling Alerts (NCCI)

  • The “Integral” Rule: If a surgeon performs a TURP (52601) or Laser procedure (52648), the following are bundled and cannot be billed separately:
    • Cystoscopy (52000)
    • Urethral Dilation (53600)
    • Meatotomy (53020)
    • Vasectomy (if performed for sterilization during the same session).
  • Catheterization: Insertion of a Foley catheter (51702) or Coude catheter (51703) for post-op drainage is included in the surgical package and is not separately payable.

2025/2026 Billing Tip (G2211)

  • Longitudinal Care: If you are the urologist managing this patient’s BPH long-term (e.g., medication management, monitoring PSA/symptoms over years), you may be eligible to append HCPCS G2211 (Complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services) to the office visit E/M code (99212-99215), provided no procedure with a global period is billed that day.

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