2027 ICD-10-CM Diagnosis Code M11.271Other chondrocalcinosis, right ankle and foot

ICD-10-CM Codes›M00–M99›M05-M14›M11

ICD-10-CM M11.271
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

M11.271 is a billable ICD-10-CM diagnosis code for other chondrocalcinosis, right 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 553 through 554. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Crystal arthropathies (excluding gout).

Code Identity

ICD-10-CM Code
M11.271
Billable Status
Yes — Valid for Submission
Code Describes
Other chondrocalcinosis, right ankle and foot
Short Description
Other chondrocalcinosis, right ankle and foot
Same as the full description in the CMS dataset.
Parent Code
M11.27
Other chondrocalcinosis, ankle and foot

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM05-M14Inflammatory polyarthropathies
CategoryM11Other crystal arthropathies
This CodeM11.271Other chondrocalcinosis, right ankle and foot

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Articular cartilage disorder of joint of left foot
  • Articular cartilage disorder of joint of right foot
  • Bilateral chondrocalcinosis of ankles
  • Chondrocalcinosis of bilateral feet
  • Chondrocalcinosis of joint of ankle AND/OR foot
  • Chondrocalcinosis of left ankle
  • Chondrocalcinosis of left foot
  • Chondrocalcinosis of right ankle
  • Chondrocalcinosis of right foot
  • Disorder of articular cartilage of joint of bilateral ankles
  • Disorder of articular cartilage of joint of left ankle
  • Disorder of articular cartilage of joint of right ankle

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to M11.271: its own notes plus those printed at block M00-M25 and Chapter 13. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Block M00-M25 applies to 2,249 codes
  • Disorders affecting predominantly peripheral (limb) joints

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)

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.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name M11.271, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming M11.271: they are not reported together with it, unless the two conditions are unrelated.

  • E83.5 Disorders of calcium metabolism
    chondrocalcinosis (M11.1-M11.2) names M11.1-M11.2, which includes this code

Excludes2 1

These codes carry an Excludes2 note naming M11.271: its condition is not part of those codes, and both may be reported when the patient has both.

  • M24.1 Other articular cartilage disorders
    chondrocalcinosis (M11.1-, M11.2-) names M11.2-, which includes this code

Clinical ClassificationClinical

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

CCSR MUS034
Crystal arthropathies (excluding gout)
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Gout

Gout is a common type of inflammatory arthritis. It causes pain, swelling, and redness in one or more joints. It usually happens as a flare, which can last for a week or two and then gets better. The flares often begin in your big toe or a lower limb.

The full article covers:

  • What is gout?
  • What causes gout?
  • Who is more likely to develop gout?
  • What are the symptoms of gout?
  • How is gout diagnosed?
  • What are the treatments for gout?

Read the full article at MedlinePlus

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

Convert M11.271 to ICD-9-CMHistory

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

ICD-9-CM
712.37 Chondrocalcin NOS-ankle
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 M11.271Overview

What is the ICD-10 code for other chondrocalcinosis, right ankle and foot?

The ICD-10-CM code for other chondrocalcinosis, right ankle and foot is M11.271 (sometimes written as M11271). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is M11.271 (Other chondrocalcinosis, ankle and foot) a billable code?

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

What MS-DRG does M11.271 group to?

When other chondrocalcinosis, right ankle and foot is the principal diagnosis on an inpatient stay, it groups to MS-DRG 554, 553, with relative weights from 0.8328 to 1.2492 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M11.271?

Under the General Equivalence Mappings, other chondrocalcinosis, right ankle and foot converts to ICD-9-CM 712.37 (chondrocalcin NOS-ankle). The mapping is approximate, so confirm the match fits the documentation.