HCC Buddy Code Card
FY 2026 Apr updateM90.549Billable
Osteonecrosis in diseases classified elsewhere, unspecified hand
CMS-HCC V28
HCC 92
RAF 0.479
CMS-HCC V24
HCC 39
RAF 0.401
RxHCC
RxHCC 80
RAF 0.204
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Alphabetic Index and Tabular path
HCC Buddy public API, FY2026 Apr updateSource load source requiredSource year 2026Updated 2026-04-01
Index trail
Osteonecrosis in diseases classified elsewhere
See Tabular List: M90.549
M90, Osteopathies in diseases classified elsewhere
M90.5, Osteonecrosis in diseases classified elsewhere
M90.54, Osteonecrosis in diseases classified elsewhere, hand
M90.549, Osteonecrosis in diseases classified elsewhere, unspecified hand
Selected code, source checked for the selected effective period
Commonly confused codes
official sourceNot listed for this effective period.
Code details and official notes
M90.549
Osteonecrosis in diseases classified elsewhere, unspecified hand
Open the shareable code page for M90.549→billableHCC mapped
Includes
official sourceNot listed for this effective period.
Excludes 1
official sourceNo Excludes 1 note is listed in this source payload.
Excludes 2
official sourceNo Excludes 2 note is listed in this source payload.
Code First
official sourceNot listed for this effective period.
Use Additional
official sourceNot listed for this effective period.
Code Also
official sourceNot listed for this effective period.
7th character
official sourceNot listed for this code in the selected Tabular payload.
Placeholder X
official sourceNot listed for this code in the selected Tabular payload.
Laterality
official sourceNo laterality instruction is listed for this code in the selected Tabular payload.
Effective period
source required- FY2026 Apr update
- Source year 2026
- Updated 2026-04-01
- HCC Buddy public API
HCC Buddy
Alphabetic Index and Tabular path
HCC Buddy public API, FY2026 Apr updateSource load source requiredSource year 2026Updated 2026-04-01
Index trail
Osteonecrosis in diseases classified elsewhere
See Tabular List: M90.549
M90, Osteopathies in diseases classified elsewhere
M90.5, Osteonecrosis in diseases classified elsewhere
M90.54, Osteonecrosis in diseases classified elsewhere, hand
M90.549, Osteonecrosis in diseases classified elsewhere, unspecified hand
Selected code, source checked for the selected effective period
Commonly confused codes
official sourceNot listed for this effective period.
Code details and official notes
M90.549
Osteonecrosis in diseases classified elsewhere, unspecified hand
Open the shareable code page for M90.549→billableHCC mapped
Includes
official sourceNot listed for this effective period.
Excludes 1
official sourceNo Excludes 1 note is listed in this source payload.
Excludes 2
official sourceNo Excludes 2 note is listed in this source payload.
Code First
official sourceNot listed for this effective period.
Use Additional
official sourceNot listed for this effective period.
Code Also
official sourceNot listed for this effective period.
7th character
official sourceNot listed for this code in the selected Tabular payload.
Placeholder X
official sourceNot listed for this code in the selected Tabular payload.
Laterality
official sourceNo laterality instruction is listed for this code in the selected Tabular payload.
Effective period
source required- FY2026 Apr update
- Source year 2026
- Updated 2026-04-01
- HCC Buddy public API
HCC Buddy Insights
HCC Mapping
HCC 92 Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis (V28)HCC 39 Bone/Joint/Muscle Infections/Necrosis (V24)HCC 80 Bone/Joint/Muscle Infections/Necrosis (RxHCC)HCC 39 Bone/Joint/Muscle Infections/Necrosis (ESRD/PACE)HCC 55 HHS-HCC 55; HHS-HCC 2026 benefit year (HHS-HCC)
RAF Value
V28: RAF: 0.479V24: RAF: 0.401RxHCC: RAF: 0.204ESRD/PACE: RAF: 0.092HHS-HCC: RAF: Varies by metal level
Model Period
FY2026 Apr update
Source
source required
Audit Caution
Close codes need documentation support before selection. Do not assume relationships.
Reviewed by the HCC Buddy Coding Team
HCC Buddy workflow band
HCC mapping, RAF, MEAT, source trail, and audit caution stay in view.
MEAT supportaudit cautionsource required
V28
HCC 92
Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis
RAF: 0.479
V24
HCC 39
Bone/Joint/Muscle Infections/Necrosis
RAF: 0.401
RxHCC
RxHCC 80
Bone/Joint/Muscle Infections/Necrosis
RAF: 0.204
ESRD/PACE
HCC 39
Bone/Joint/Muscle Infections/Necrosis
RAF: 0.092
HHS-HCC
HCC 55
HHS-HCC 55; HHS-HCC 2026 benefit year
RAF: Varies by metal level
MEAT checklist
Reviewed by the HCC Buddy Coding TeamMonitor, Evaluate, Assess, or Treat must be supported in the provider note.
HCC Buddy guidance, not official ICD-10-CM text.
Audit caution
Reviewed by the HCC Buddy Coding TeamClose codes need documentation support before selection. Do not assume relationships.
HCC Buddy guidance, not official ICD-10-CM text.
Reviewer sign-off
Reviewed by the HCC Buddy Coding TeamMEAT, documentation support, audit cautions, and close-code guidance are reviewed and approved for this effective period.
HCC Buddy enrichment is separate from official source text.
Last updated: April 1, 2026 · Not a substitute for official coding guidelines. No PHI or patient data.
Reviewed by the HCC Buddy Coding TeamFY2026 Apr update
Code
M90.549
V28 HCC
HCC 92
RAF
0.479
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