M17.1 ICD-10-CA code: Other primary gonarthrosis
M17.1 is the ICD-10-CA code for “Other primary gonarthrosis” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
M17.1Other primary gonarthrosis
ICD-10-CA · Canada · Also written M171
Index terms
Entries in CIHI’s alphabetical index that lead to M17.1. Searching the index by the condition the note names is how coders reach this code.
- Gonarthrosis, primary (unilateral)
- Osteoarthritis, joint(s), knee (unilateral, bilateral), unilateral or unspecified (laterality), primary
Notes for M17.1
As CIHI prints them, with any note M17.1 takes from the headings above it.
Includes
- Primary gonarthrosis:• NOS• unilateral
- Disorders affecting predominantly peripheral (limb) jointsFrom M00-M25 Arthropathies
Excludes
Conditions classified elsewhere.
- Osteoarthritis of:• spine (M47.-)• temporomandibular joint (TMJ) (K07.68)From M15-M19 Arthrosis
- 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
- In this block the term osteoarthritis is used as a synonym for arthrosis or osteoarthrosis. The term primary has been used with its customary clinical meaning of no underlying or determining condition identified.From M15-M19 Arthrosis
- 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 M17.1 sits
- 1ChapterChapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99)
- 2Block M00-M25Arthropathies
- 3Block M15-M19Arthrosis
- 4Category M17Gonarthrosis [arthrosis of knee]
- 5Valid code M17.1Other primary gonarthrosis
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
What does ICD-10-CA code M17.1 mean?
M17.1 is the ICD-10-CA code for “Other primary gonarthrosis” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is M17.1 in ICD-10-CA?
M17.1 sits under M17 Gonarthrosis [arthrosis of knee], within M15-M19 Arthrosis, within M00-M25 Arthropathies, within Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99).
What coding notes apply to M17.1?
ICD-10-CA lists Includes, Note, Excludes notes for M17.1, 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.