ICD-10-CM 2027 diagnosis code
M86.18Other acute osteomyelitis, other site
M86.18 is a valid, billable ICD-10-CM code for other acute osteomyelitis, other site. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About M86.18
M86.18 is the ICD-10-CM diagnosis code for other acute osteomyelitis, other site. It belongs to category M86 (osteomyelitis), block M86-M90 (other osteopathies) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within M86.1, choose M86.18 (other site) only when documentation doesn't support a more specific option: unspecified site (M86.10), shoulder (M86.11), humerus (M86.12), radius and ulna (M86.13), hand (M86.14), femur (M86.15), tibia and fibula (M86.16), ankle and foot (M86.17) and 1 more.
Use an additional code (B95-B97) to identify infectious agent. Use an additional code to identify major osseous defect, if applicable (M89.7-).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 456 (Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, or Infection with MCC, relative weight 7.6244), DRG 457 (Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, or Infection with CC, relative weight 5.3668), DRG 458 (Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, or Infection without CC/MCC, relative weight 4.0388), DRG 539 (Osteomyelitis with MCC, relative weight 1.9385), DRG 540 (Osteomyelitis with CC, relative weight 1.3079) and DRG 541 (Osteomyelitis without CC/MCC, relative weight 0.8297), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 730.08 (acute osteomyelitis, other specified sites).
Notes that apply from higher levels
Instructions written at a parent level also apply to M86.18.
› From M86 Osteomyelitis
Broader instructions also apply from M86-M90 Other osteopathies and Chapter 13: Diseases of the musculoskeletal system and connective tissue.
Alphabetic index entries
5 entriesTerms in the official ICD-10-CM index that lead to M86.18.
- Osteomyelitis (general) (infective) (localized) (neonatal) (purulent) (septic) (staphylococcal) (streptococcal) (suppurative) (with periostitis) › acute › ilium
- Osteomyelitis (general) (infective) (localized) (neonatal) (purulent) (septic) (staphylococcal) (streptococcal) (suppurative) (with periostitis) › acute › ischium
- Osteomyelitis (general) (infective) (localized) (neonatal) (purulent) (septic) (staphylococcal) (streptococcal) (suppurative) (with periostitis) › acute › neck
- Osteomyelitis (general) (infective) (localized) (neonatal) (purulent) (septic) (staphylococcal) (streptococcal) (suppurative) (with periostitis) › acute › rib
- Osteomyelitis (general) (infective) (localized) (neonatal) (purulent) (septic) (staphylococcal) (streptococcal) (suppurative) (with periostitis) › acute › skull
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 08 · Diseases and Disorders of the Musculoskeletal System and Connective Tissue
MDC 08 · Diseases and Disorders of the Musculoskeletal System and Connective Tissue
ICD-9-CM equivalent
Converter →- 730.08Acute osteomyelitis, other specified sitesapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about M86.18
Is M86.18 billable?
- Yes. M86.18 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M86.18 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M86.18 as a principal diagnosis.
Is M86.18 a CC or MCC?
- M86.18 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.
What DRG does M86.18 group to?
- M86.18 is used in the MS-DRG v44.0 logic for MS-DRG 456 (Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, or Infection with MCC), MS-DRG 457 (Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, or Infection with CC), MS-DRG 458 (Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, or Infection without CC/MCC), MS-DRG 539 (Osteomyelitis with MCC), MS-DRG 540 (Osteomyelitis with CC) and MS-DRG 541 (Osteomyelitis without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for M86.18?
- The CMS General Equivalence Mappings map M86.18 to ICD-9-CM 730.08.