Question 1

What is ICD-10 code N35.913?

Accepted Answer

N35.913 is the ICD-10-CM diagnosis code for unspecified membranous urethral stricture, male. A narrowing or tightening of the membranous portion of the urethra (the middle section of the urinary tube) in males, where the specific cause is not identified. N35.913 sits in the ICD-10-CM chapter for diseases of the genitourinary system (n00-n99), within the section covering other diseases of the urinary system (n30-n39).

N35.913 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

This code is used when the stricture location is specifically documented as membranous but the etiology is unknown or unspecified.

Question 2

Is N35.913 an HCC code?

Accepted Answer

No. N35.913 is a billable ICD-10-CM code but does not map to any payment HCC category under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can still be reported on Medicare Advantage encounter data submissions, but it does not contribute to the beneficiary's Risk Adjustment Factor (RAF) score and therefore does not affect the risk-adjusted capitation payment to the plan. V28 reached 100% phase-in for payment year 2026.

Question 3

Is N35.913 billable?

Accepted Answer

Yes. N35.913 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. N35.913 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Question 4

What is the V28 vs V24 difference for N35.913?

Accepted Answer

N35.913 does not map to a payment HCC under either the CMS-HCC V28 risk adjustment model or the older V24 model. V28 reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Because neither model rewards N35.913 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a payment HCC.

Question 5

What should coders know when reporting N35.913?

Accepted Answer

This code is used when the stricture location is specifically documented as membranous but the etiology is unknown or unspecified Do not use this code if a specific cause (trauma, infection, iatrogenic) is documented; use a more specific N35 code instead

N35.913

Is N35.913 an HCC code?

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