2026 ICD-10-CM Diagnosis Code M77.52Other enthesopathy of left foot and ankle

ICD-10-CM Codes›M00–M99›M70-M79›M77

ICD-10-CM M77.52
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M77.52 is a billable ICD-10-CM diagnosis code for other enthesopathy of left foot and ankle. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 557 through 558. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Tendon and synovial disorders.

Code Identity

ICD-10-CM Code
M77.52
Billable Status
Yes — Valid for Submission
Code Describes
Other enthesopathy of left foot and ankle
Short Description
Other enthesopathy of left foot and ankle
Same as the full description in the CMS dataset.
Parent Code
M77.5
Other enthesopathy of foot and ankle

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM70-M79Other soft tissue disorders
CategoryM77Other enthesopathies
This CodeM77.52Other enthesopathy of left foot and ankle

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Achilles bursitis
  • Bilateral bursitis of calcaneal tendon bursae
  • Bilateral bursitis of feet
  • Bilateral capsulitis of ankles
  • Bilateral capsulitis of intertarsal joints
  • Bilateral capsulitis of metatarsophalangeal joint of feet
  • Bilateral enthesopathy of ankles
  • Bilateral enthesopathy of feet
  • Bilateral intermetatarsal bursitis
  • Bilateral retrocalcaneal bursitis of feet
  • Bone spur of left foot
  • Bursitis of left Achilles bursa
  • Bursitis of left foot
  • Bursitis of right Achilles bursa
  • Bursitis of right foot
  • Capsulitis of left ankle
  • Capsulitis of left tarsus
  • Capsulitis of metatarsophalangeal joint of left foot
  • Capsulitis of metatarsophalangeal joint of right foot
  • Capsulitis of right ankle
  • Capsulitis of right tarsus
  • Capsulitis of tarsus
  • Enthesopathy of ankle AND/OR tarsus
  • Enthesopathy of ankle region
  • Enthesopathy of foot region
  • Enthesopathy of left ankle
  • Enthesopathy of left foot
  • Enthesopathy of right ankle
  • Enthesopathy of right foot
  • Enthesopathy of toe of left foot
  • Exostosis of left foot
  • Intermetatarsal bursitis
  • Intermetatarsal bursitis of left foot
  • Intermetatarsal bursitis of right foot
  • Postcalcaneal bursitis
  • Retrocalcaneal bursitis of left foot
  • Retrocalcaneal bursitis of right foot

Clinical ClassificationClinical

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

CCSR MUS009
Tendon and synovial disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Foot Injuries and Disorders

Each of your feet has 26 bones, 33 joints, and more than 100 tendons, muscles, and ligaments. No wonder a lot of things can go wrong. Here are a few common problems:

Read the full article at MedlinePlus

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

Convert M77.52 to ICD-9-CMHistory

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

ICD-9-CM
726.79 Ankle enthesopathy 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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M77.52Overview

Is M77.52 (Other enthesopathy of foot and ankle) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other enthesopathy of left foot and ankle on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M77.52 group to?

When other enthesopathy of left foot and ankle is the principal diagnosis on an inpatient stay, it groups to MS-DRG 557, 558, with relative weights from 0.8932 to 1.4869 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M77.52?

Under the General Equivalence Mappings, other enthesopathy of left foot and ankle converts to ICD-9-CM 726.79 (ankle enthesopathy NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.