M05 ICD-10-CA category: Seropositive rheumatoid arthritis
M05 isn’t a code on its own. Choose one of the 6 codes beneath it, the one the documentation supports.
Official description
M05Seropositive rheumatoid arthritis
ICD-10-CA · Canada
Codes in M05
M05 isn’t a code on its own. Open the code that matches what the note documents.
Notes for M05
As CIHI prints them, with any note M05 takes from the headings above it.
Includes
- Disorders affecting predominantly peripheral (limb) jointsFrom M00-M25 Arthropathies
Excludes
Conditions classified elsewhere.
- Rheumatic fever (I00)rheumatoid arthritis (of):• juvenile (M08.-)• spine (M45)
- 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
- 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 M05 sits
- 1ChapterChapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99)
- 2Block M00-M25Arthropathies
- 3Block M05-M14Inflammatory polyarthropathies
- 4Category M05Seropositive rheumatoid arthritis
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.
Frequently asked questions
Is M05 a valid ICD-10-CA code?
No. M05 (Seropositive rheumatoid arthritis) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 6 codes; record the one the documentation supports.
Where is M05 in ICD-10-CA?
M05 sits under M05-M14 Inflammatory polyarthropathies, within M00-M25 Arthropathies, within Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99).
What coding notes apply to M05?
ICD-10-CA lists Excludes, Includes, Note notes for M05, 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.