N99.538
BillableOther complication of continent stoma of urinary tract
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is N99.538 an HCC code?
Yes. N99.538 maps to Complications of Specified Implanted Device or Graft under the V24 model but is not retained in V28.
HCC Category Mapping
RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.
MEAT Criteria for N99.538
For N99.538 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically — it has to be re-documented and supported each calendar year.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed N99.538 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
N99.538 is the ICD-10-CM diagnosis code for other complication of continent stoma of urinary tract. Other problems or complications occurring with a surgically created urine drainage opening that controls urine flow. N99.538 sits in the ICD-10-CM chapter for diseases of the genitourinary system (n00-n99), within the section covering intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified (n99).
Under the older CMS-HCC V24 model, N99.538 maps to Complications of Specified Implanted Device or Graft (HCC 176) with a community, non-dual, aged base RAF weight of 0.529. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.
Use this code only when the complication doesn't fit other specific N99.53x codes. Because N99.538 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for N99.538 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when the complication doesn't fit other specific N99.53x codes
- •Clearly document the nature of the complication for accurate coding
Clinical Significance
Other complications of continent urinary stomas encompass various issues beyond standard categories that can affect the complex continence mechanism. These complications require specialized urological expertise and may significantly impact the functional success of continent diversions.
Documentation Requirements
- ✓Documentation of continent urinary stoma type
- ✓Specific description of the complication
- ✓Impact on continence and catheterization function
- ✓Clinical presentation and symptoms
- ✓Duration and progression of the complication
- ✓Treatment measures implemented
- ✓Provider assessment of functional status