2026 ICD-10-CM Diagnosis Code M65.251Calcific tendinitis, right thigh

ICD-10-CM Codes›M00–M99›M65-M67›M65

ICD-10-CM M65.251
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M65.251 is a billable ICD-10-CM diagnosis code for calcific tendinitis, right thigh. 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
M65.251
Billable Status
Yes — Valid for Submission
Code Describes
Calcific tendinitis, right thigh
Short Description
Calcific tendinitis, right thigh
Same as the full description in the CMS dataset.
Parent Code
M65.25
Calcific tendinitis, thigh

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM65-M67Disorders of synovium and tendon
CategoryM65Synovitis and tenosynovitis
This CodeM65.251Calcific tendinitis, right thigh

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral disorder of tendon of thighs
  • Bilateral tendinitis of hips
  • Calcific tendinitis of bilateral hips
  • Calcific tendinitis of bilateral thighs
  • Calcific tendinitis of hip region
  • Calcific tendinitis of left hip
  • Calcific tendinitis of left thigh
  • Calcific tendinitis of right hip
  • Calcific tendinitis of right thigh
  • Calcific tendinitis of thigh
  • Tendinitis of hip
  • Tendinitis of left hip
  • Tendinitis of right hip
  • Tendon disorder of left thigh
  • Tendon disorder of right thigh

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

Tendinitis

Tendons are flexible bands of tissue that connect muscles to bones. They help your muscles move your bones. Tendinitis is the severe swelling of a tendon.

Read the full article at MedlinePlus

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

Convert M65.251 to ICD-9-CMHistory

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

ICD-9-CM
727.82 Calcium deposit tendon
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 M65.251Overview

Is M65.251 (Calcific tendinitis, thigh) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report calcific tendinitis, right thigh on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M65.251 group to?

When calcific tendinitis, right thigh 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 M65.251?

Under the General Equivalence Mappings, calcific tendinitis, right thigh converts to ICD-9-CM 727.82 (calcium deposit tendon). 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.