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M00.91 ICD-10-CA code: Pyogenic arthritis, unspecified, shoulder region

M00.91 is the ICD-10-CA code for “Pyogenic arthritis, unspecified, shoulder region” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.

Official description

M00.91

Pyogenic arthritis, unspecified, shoulder region

Short description: Pyogenic arthritis NOS shoulder

ICD-10-CA · Canada · Also written M0091

Index terms

Entries in CIHI’s alphabetical index that lead to M00.91. Searching the index by the condition the note names is how coders reach this code.

  • Infection, infected (opportunistic), shoulder (joint) NEC

Notes for M00.91

As CIHI prints them, with any note M00.91 takes from the headings above it.

Includes

Excludes

Conditions classified elsewhere.

  • Infection and inflammatory reaction due to internal joint prosthesis (T84.5-)From M00 Pyogenic arthritis
  • Certain:• conditions originating in the perinatal period (P00-P96)• disorders of the temporomandibular joint (K07.6)• infectious and parasitic diseases (A00-B99)compartment syndrome (T79.6)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99)

Note

  • [To review the anatomical site captured in the 5th character subclassification see Chapter XIII]From M00.9 Pyogenic arthritis, unspecified
  • This block comprises arthropathies due to microbiological agents. Distinction is made between the following types of etiological relationship:a) direct infection of joint, where organisms invade synovial tissue and microbial antigen is present in the joint;b) indirect infection, which may be of two types: a reactive arthropathy, where microbial infection of the body is established but neither organisms nor antigens can be identified in the joint, and a postinfective arthropathy, where microbial antigen is present but recovery of an organism is inconstant and evidence of local multiplication is lacking.From M00-M03 Infectious arthropathies
  • The following fifth characters represent the following sites of involvement:0 Multiple sites1 Shoulder region: clavical , scapula — joint acromioclavicular, glenohumeral, sternoclavicular2 Upper arm: humerus — elbow joint,3 Forearm: radius , ulna — wrist joint,4 Hand: carpus, fingers, metacarpus — joints between these bones,5 Pelvic region and thigh: buttock , femur , pelvis — joint hip , sacroiliac6 Lower leg: fibula , tibia — knee joint7 Ankle and foot: metatarsus, tarsus, toes — other joints in foot8 Other:head neck ribs skull trunk vertebral column9 Site unspecifiedFrom Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99)

Where M00.91 sits

  1. 1ChapterChapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99)
  2. 2Block M00-M25Arthropathies
  3. 3Block M00-M03Infectious arthropathies
  4. 4Category M00Pyogenic arthritis
  5. 5Subcategory M00.9Pyogenic arthritis, unspecified
  6. 6Valid code M00.91Pyogenic arthritis, unspecified, shoulder region

Source and release

Data release
ICD-10-CA · FY 2026–2027
Effective date
Apr 1, 2026
Publisher
CIHI

This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.

See M00.91 in the CIHI source

Frequently asked questions

What does ICD-10-CA code M00.91 mean?

M00.91 is the ICD-10-CA code for “Pyogenic arthritis, unspecified, shoulder region” in CIHI’s ICD-10-CA FY 2026–2027 release.

Where is M00.91 in ICD-10-CA?

M00.91 sits under M00.9 Pyogenic arthritis, unspecified, within M00 Pyogenic arthritis, within M00-M03 Infectious arthropathies, within M00-M25 Arthropathies, within Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99).

What coding notes apply to M00.91?

ICD-10-CA lists Note, Includes, Excludes notes for M00.91, including those from the headings it sits under. They are listed on this page with where each one comes from.

Which ICD-10-CA release does this page use?

It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.

Codes beside M00.91

M00.90Pyogenic arthritis, unspecified, multiple sitesM00.92Pyogenic arthritis, unspecified, upper armM00.93Pyogenic arthritis, unspecified, forearmM00.94Pyogenic arthritis, unspecified, handM00.95Pyogenic arthritis, unspecified, pelvic region and thighM00.96Pyogenic arthritis, unspecified, lower legM00.97Pyogenic arthritis, unspecified, ankle and footM00.98Pyogenic arthritis, unspecified, other siteM00.99Pyogenic arthritis, unspecified, unspecified site