2027 ICD-10-CM Diagnosis Code M86.8X51Other osteomyelitis, right thigh

ICD-10-CM Codes›M00–M99›M86-M90›M86

ICD-10-CM M86.8X51
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

M86.8X51 is a billable ICD-10-CM diagnosis code for other osteomyelitis, right thigh. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 539 through 541. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 221 closely related codes. Coders also document this condition as osteitis of bilateral femurs.

Code Identity

ICD-10-CM Code
M86.8X51
Billable Status
Yes — Valid for Submission
Code Describes
Other osteomyelitis, right thigh
Short Description
Other osteomyelitis, right thigh
Same as the full description in the CMS dataset.
Parent Code
M86.8X5
Other osteomyelitis, thigh

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM86-M90Other osteopathies
CategoryM86Osteomyelitis
This CodeM86.8X51Other osteomyelitis, right thigh

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Osteitis of bilateral femurs
  • Osteitis of left femur
  • Osteitis of right femur
  • Osteomyelitis of bilateral femurs
  • Osteomyelitis of left femur
  • Osteomyelitis of right femur
  • Periostitis of bilateral femurs
  • Periostitis of femur
  • Periostitis of left femur
  • Periostitis of right femur

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to M86.8X51: its own notes plus those printed at M86, block M86-M90, and Chapter 13. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From M86 Osteomyelitis applies to 195 codes
From Block M86-M90 Other osteopathies applies to 732 codes
  • postprocedural osteopathies (M96.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From M86 Osteomyelitis applies to 195 codes
From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From M86 Osteomyelitis applies to 195 codes
  • code (B95-B97) to identify infectious agent
  • code to identify major osseous defect, if applicable (M89.7-)

Notes

General instructions on how these codes are used.

From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name M86.8X51, its category, or a range that includes it.

Code First 1

These codes say to code first a condition named in the note, and M86.8X51 is one of the conditions named.

  • M89.7 Major osseous defect
    osteomyelitis (M86.-) names M86.-, which includes this code

Clinical InformationClinical

  • Osteomyelitis

    inflammation of the bone as a result of infection. it may be caused by a variety of infectious agents, especially pyogenic (pus - producing) bacteria.

Code History & ChangesHistory

New Code M86.8X51 was added to the ICD-10-CM code set for FY 2027, effective October 1, 2026.

Replacement M86.8X51 replaces the following previously assigned code(s):

  • M86.8X5 - Other osteomyelitis, thigh
FY 2027AddedAdded to the ICD-10-CM code setEffective October 1, 2026.
FY 2027CurrentRevised in the current code setEffective October 1, 2026 through September 30, 2027.

Questions About M86.8X51Overview

What is the ICD-10 code for other osteomyelitis, right thigh?

The ICD-10-CM code for other osteomyelitis, right thigh is M86.8X51 (sometimes written as M868X51). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is M86.8X51 (Other osteomyelitis, thigh) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other osteomyelitis, right thigh on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does M86.8X51 group to?

When other osteomyelitis, right thigh is the principal diagnosis on an inpatient stay, it groups to MS-DRG 541, 539, 540, with relative weights from 0.8293 to 1.9376 depending on complications. Higher weights mean higher Medicare reimbursement.

Is M86.8X51 a CC or MCC?

CMS lists M86.8X51 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 221 closely related codes in its exclusion list.

Can M86.8X51 be reported with B67.2?

Not as a rule. The Excludes1 note at M86, which applies to M86.8X51, lists "echinococcus (B67.2)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).