N99.520 ICD-10-CM Code: Hemorrhage of incontinent external stoma of urinary tract
N99.520 is not a CMS-HCC payment code. MEAT criteria · RAF calculator · free HCC coding tools
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FY 2026 Apr update / Diseases of the genitourinary system (N00-N99) / Intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified (N99)
N99.520
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceHemorrhage of incontinent external stoma of urinary tract
Bleeding occurs from an incontinent external urinary stoma, which is a surgically created opening on the skin for continuous urine drainage into an external pouch. This represents abnormal blood loss from the stoma.
Buddy Insight
Hemorrhage from an incontinent external urinary stoma represents a potentially serious complication requiring immediate evaluation and management.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
MappedHCC 176
RAF 0.582
ACA/HHS
N/A—
Not mapped
ESRD/PACE
MappedHCC 176
RAF 0.000
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for N99.520 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for N99.520 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for N99.520 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for N99.520 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for N99.520 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for N99.520 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for N99.520 in this effective period.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is N99.520 an HCC code?
Yes. N99.520 maps to Complications of Specified Implanted Device or Graft under the V24 model but is not retained in V28.
- Code
- N99.520
- Description
- Hemorrhage of incontinent external stoma of urinary tract
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
Each model's RAF is its CMS base weight for that model's standard population, so weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. 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.
Work N99.520 in the Code Book — tabular path, V28 RAF, and MEAT checklist →
MEAT Criteria for N99.520
For N99.520 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 N99.520 during that encounter, not just copy-forwarded from a problem list.
Coder workflow notes
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What This Code Means
N99.520 is the ICD-10-CM diagnosis code for hemorrhage of incontinent external stoma of urinary tract. Bleeding occurs from an incontinent external urinary stoma, which is a surgically created opening on the skin for continuous urine drainage into an external pouch. This represents abnormal blood loss from the stoma. N99.520 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, N99.520 maps to Complications of Specified Implanted Device or Graft (HCC 176) with a community, non-dual, aged base RAF weight of 0.582. 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.
Distinguish between incontinent stoma (continuous drainage) and continent stoma (catheterizable pouch). Because N99.520 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 N99.520 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Distinguish between incontinent stoma (continuous drainage) and continent stoma (catheterizable pouch)
- •Verify the stoma is external and incontinent before assigning this code
Clinical Significance
Hemorrhage from an incontinent external urinary stoma represents a potentially serious complication requiring immediate evaluation and management. This bleeding can indicate underlying pathology, improper fitting equipment, or tissue trauma that may compromise the stoma function.
Documentation Requirements
- ✓Documentation of incontinent external urinary stoma type
- ✓Description of bleeding severity and characteristics
- ✓Duration and frequency of hemorrhagic episodes
- ✓Associated symptoms (pain, swelling, discharge)
- ✓Hemodynamic impact if significant bleeding
- ✓Interventions performed to control bleeding
- ✓Underlying cause if identified (trauma, infection, etc.)
Commonly Confused Codes
- •N99.521: Infection of incontinent external stoma (infectious vs bleeding complication)
- •K94.03: Hemorrhage of colostomy (colostomy vs urinary stoma)
- •T83.83XA: Hemorrhage due to genitourinary prosthetic devices (device-related bleeding)
- •N99.530: Hemorrhage of continent stoma (continent vs incontinent stoma)