ICD-10-CM 2027 diagnosis code

M11.26Other chondrocalcinosis, knee

Not billable — use a more specific code

M11.26 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About M11.26

M11.26 is the ICD-10-CM diagnosis code for other chondrocalcinosis, knee. It belongs to category M11 (other crystal arthropathies), block M05-M14 (inflammatory polyarthropathies) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within M11.2 (other chondrocalcinosis), M11.26 is specifically for other chondrocalcinosis, knee. Related codes cover unspecified site (M11.20), shoulder (M11.21), elbow (M11.22), wrist (M11.23), hand (M11.24), hip (M11.25), ankle and foot (M11.27), vertebrae (M11.28) and 1 more.

To report this condition, pick the subcode that matches the documentation: M11.261 (knee), M11.262 (knee) and M11.269 (knee).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under M11.26

Notes that apply from higher levels

Instructions written at a parent level also apply to M11.26.

Broader instructions also apply from Chapter 13: Diseases of the musculoskeletal system and connective tissue.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to M11.26.

Code history

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2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about M11.26

Is M11.26 billable?: No. M11.26 is a header code. Report one of its more specific subcodes instead.