M86.1 ICD-10-CM Code: Other acute osteomyelitis
M86.1 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC Buddy coding tools
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Other osteopathies (M86-M90)
M86.1
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidanceOther acute osteomyelitis
Other acute osteomyelitis
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 M86.1 in this effective period.
Excludes 2
Official- ostemyelitis of:
- orbit (H05.0-)
- petrous bone (H70.2-)
- vertebra (M46.2-)
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for M86.1 in this effective period.
Excludes 1
Official- osteomyelitis due to:
- echinococcus (B67.2)
- gonococcus (A54.43)
- salmonella (A02.24)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for M86.1 in this effective period.
Use Additional
Official- code (B95-B97) to identify infectious agent
Code Also
OfficialICD-10-CM does not list Code Also instructions for M86.1 in this effective period.
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 →
- Code
- M86.1
- Description
- Other acute osteomyelitis
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- No
- Payment year
- 2026
Coder workflow notes
Get the V28 mapping + MEAT cheat sheet
One printable reference: check representative V28 mappings and the documentation reminders your note needs. Free, no card.
Free PDF. No card. Unsubscribe anytime.
What This Code Means
M86.1 is the ICD-10-CM diagnosis code for other acute osteomyelitis. M86.1 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).
Header codes like M86.1 cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for M86.1 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.