2027 ICD-10-CM Diagnosis Code M71.179Other infective bursitis, unspecified ankle and foot

ICD-10-CM Codes›M00–M99›M70-M79›M71

ICD-10-CM M71.179
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

M71.179 is a billable ICD-10-CM diagnosis code for other infective bursitis, unspecified ankle and foot. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 557 through 558. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified connective tissue disease.

Code Identity

ICD-10-CM Code
M71.179
Billable Status
Yes — Valid for Submission
Code Describes
Other infective bursitis, unspecified ankle and foot
Short Description
Other infective bursitis, unspecified ankle and foot
Same as the full description in the CMS dataset.
Parent Code
M71.17
Other infective bursitis, ankle and foot

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM70-M79Other soft tissue disorders
CategoryM71Other bursopathies
This CodeM71.179Other infective bursitis, unspecified ankle and foot

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to M71.179: its own notes plus those printed at M71.1, M71, 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 M71 Other bursopathies applies to 138 codes
  • bunion (M20.1)
  • bursitis related to use, overuse or pressure (M70.-)
  • enthesopathies (M76-M77)

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 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 M71.1 Other infective bursitis applies to 24 codes
  • code (B95.-, B96.-) to identify causative organism

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.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MUS025
Other specified connective tissue disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Ankle Injuries and Disorders

Your ankle bone and the ends of your two lower leg bones make up the ankle joint. Your ligaments, which connect bones to one another, stabilize and support it. Your muscles and tendons move it.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert M71.179 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
727.3 Bursitis NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About M71.179Overview

What is the ICD-10 code for other infective bursitis, unspecified ankle and foot?

The ICD-10-CM code for other infective bursitis, unspecified ankle and foot is M71.179 (sometimes written as M71179). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is M71.179 (Other infective bursitis, ankle and foot) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other infective bursitis, unspecified ankle and foot on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does M71.179 group to?

When other infective bursitis, unspecified ankle and foot is the principal diagnosis on an inpatient stay, it groups to MS-DRG 557, 558, with relative weights from 0.8873 to 1.4883 depending on complications. Higher weights mean higher Medicare reimbursement.

Can M71.179 be reported with M20.1?

Not as a rule. The Excludes1 note at M71, which applies to M71.179, lists "bunion (M20.1)". 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).

Does M71.179 need an additional code?

When the condition applies, yes. The Use Additional Code note at M71.1, which applies to M71.179, reads: code (B95.-, B96.-) to identify causative organism. The additional code is reported after M71.179.