2027 ICD-10-CM Diagnosis Code M86.8X61Other osteomyelitis, right lower leg
ICD-10-CM Codes›M00–M99›M86-M90›M86
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- 7th Character 1
- New 2027 Code
M86.8X61 is a billable ICD-10-CM diagnosis code for other osteomyelitis, right lower leg. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 400, 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 bilateral periostitis of lower legs.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Bilateral periostitis of lower legs
- Osteomyelitis of bilateral tibias
- Osteomyelitis of left tibia
- Osteomyelitis of right tibia
- Periostitis of left lower leg
- Periostitis of lower leg
- Periostitis of right lower leg
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M86.8X61: 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.
- 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.
- 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.
Notes
General instructions on how these codes are used.
- 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 M86.8X61, its category, or a range that includes it.
Code First 1
These codes say to code first a condition named in the note, and M86.8X61 is one of the conditions named.
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 M86.8X61 was added to the ICD-10-CM code set for FY 2027, effective October 1, 2026.
Replacement M86.8X61 replaces the following previously assigned code(s):
- M86.8X6 - Other osteomyelitis, lower leg
Questions About M86.8X61Overview
What is the ICD-10 code for other osteomyelitis, right lower leg?
The ICD-10-CM code for other osteomyelitis, right lower leg is M86.8X61 (sometimes written as M868X61). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is M86.8X61 (Other osteomyelitis, lower leg) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other osteomyelitis, right lower leg on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does M86.8X61 group to?
When other osteomyelitis, right lower leg is the principal diagnosis on an inpatient stay, it groups to MS-DRG 541, 400, 539, 540, with relative weights from 0.8293 to 2.0249 depending on complications. Higher weights mean higher Medicare reimbursement.
Is M86.8X61 a CC or MCC?
CMS lists M86.8X61 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 M86.8X61 be reported with B67.2?
Not as a rule. The Excludes1 note at M86, which applies to M86.8X61, 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).
