M90.671 ICD-10-CM Code: Osteitis deformans in neoplastic diseases, right ankle and foot
HCC Buddy Code Card
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FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Other osteopathies (M86-M90)
M90.671
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOsteitis deformans in neoplastic diseases, right ankle and foot
Bone deformity and inflammation in the right ankle and foot caused by cancer or other neoplastic diseases affecting the tarsal, metatarsal, or other foot bones.
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 M90.671 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for M90.671 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for M90.671 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for M90.671 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for M90.671 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for M90.671 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for M90.671 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 M90.671 an HCC code?
No. M90.671 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- M90.671
- Description
- Osteitis deformans in neoplastic diseases, right ankle and foot
- 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
M90.671 is the ICD-10-CM diagnosis code for osteitis deformans in neoplastic diseases, right ankle and foot. Bone deformity and inflammation in the right ankle and foot caused by cancer or other neoplastic diseases affecting the tarsal, metatarsal, or other foot bones. M90.671 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering other osteopathies (m86-m90).
M90.671 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.
Confirm right ankle and foot laterality in documentation to differentiate from left side (M90.672).
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M90.671 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Confirm right ankle and foot laterality in documentation to differentiate from left side (M90.672)
- •Include the underlying neoplastic disease code to establish the causal relationship and ensure proper clinical documentation