2026 ICD-10-CM Diagnosis Code M21.522Acquired clubhand, left hand

ICD-10-CM Codes›M00–M99›M20-M25›M21

ICD-10-CM M21.522
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M21.522 is a billable ICD-10-CM diagnosis code for acquired clubhand, left hand. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as acquired clubhand. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Acquired deformities (excluding foot).

Code Identity

ICD-10-CM Code
M21.522
Billable Status
Yes — Valid for Submission
Code Describes
Acquired clubhand, left hand
Short Description
Acquired clubhand, left hand
Same as the full description in the CMS dataset.
Parent Code
M21.52
Acquired clubhand

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM20-M25Other joint disorders
CategoryM21Other acquired deformities of limbs
This CodeM21.522Acquired clubhand, left hand

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired clubhand
  • Acquired left clubhand

Clinical ClassificationClinical

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

CCSR MUS023
Acquired deformities (excluding foot)
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Hand Injuries and Disorders

No matter how old you are or what you do for a living, you are always using your hands. When there is something wrong with them, you may not be able to do your regular activities.

Read the full article at MedlinePlus

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

Convert M21.522 to ICD-9-CMHistory

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

ICD-9-CM
736.07 Club hand, acquired
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 M21.522Overview

Is M21.522 (Acquired clubhand) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report acquired clubhand, left hand on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of M21.522?

Under the General Equivalence Mappings, acquired clubhand, left hand converts to ICD-9-CM 736.07 (club hand, acquired). 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.