N80.A1 ICD-10-CM Code: Superficial endometriosis of bladder
HCC Buddy Code Card
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FY 2026 Apr update / Diseases of the genitourinary system (N00-N99) / Noninflammatory disorders of female genital tract (N80-N98)
N80.A1
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceSuperficial endometriosis of bladder
Endometrial tissue (the lining of the uterus) grows in a shallow layer on the bladder, causing pain and urinary symptoms.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for N80.A1 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for N80.A1 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for N80.A1 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for N80.A1 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for N80.A1 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for N80.A1 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for N80.A1 in this effective period.
Buddy Documentation Tip
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 N80.A1 an HCC code?
No. N80.A1 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- N80.A1
- Description
- Superficial endometriosis of bladder
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
N80.A1 is the ICD-10-CM diagnosis code for superficial endometriosis of bladder. Endometrial tissue (the lining of the uterus) grows in a shallow layer on the bladder, causing pain and urinary symptoms. N80.A1 sits in the ICD-10-CM chapter for diseases of the genitourinary system (n00-n99), within the section covering noninflammatory disorders of female genital tract (n80-n98).
N80.A1 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 specifies superficial involvement, meaning the endometrial tissue has not penetrated deeply into the bladder wall.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for N80.A1 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code specifies superficial involvement, meaning the endometrial tissue has not penetrated deeply into the bladder wall
- •Verify documentation confirms bladder location and superficial depth before assigning this code