Q51.820 ICD-10-CM Code: Cervical duplication
HCC Buddy Code Card
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FY 2026 Apr update / Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0) / Congenital malformations of genital organs (Q50-Q56)
Q51.820
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceCervical duplication
A birth defect where the cervix (the lower part of the uterus) is duplicated or present in two separate structures instead of one.
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 Q51.820 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for Q51.820 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for Q51.820 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for Q51.820 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for Q51.820 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for Q51.820 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for Q51.820 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 Q51.820 an HCC code?
No. Q51.820 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- Q51.820
- Description
- Cervical duplication
- 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
Q51.820 is the ICD-10-CM diagnosis code for cervical duplication. A birth defect where the cervix (the lower part of the uterus) is duplicated or present in two separate structures instead of one. Q51.820 sits in the ICD-10-CM chapter for congenital malformations, deformations and chromosomal abnormalities (q00-qa0), within the section covering congenital malformations of genital organs (q50-q56).
Q51.820 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.
Distinguish between cervical duplication and uterine duplication, which are coded separately.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Q51.820 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Distinguish between cervical duplication and uterine duplication, which are coded separately
- •Confirm imaging or surgical findings document the duplication of cervical tissue specifically