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M85.33 ICD-10-CA code: Osteitis condensans, forearm

M85.33 is the ICD-10-CA code for “Osteitis condensans, forearm” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.

Official description

M85.33

Osteitis condensans, forearm

Short description: Osteitis condensans forearm

ICD-10-CA · Canada · Also written M8533

Notes for M85.33

As CIHI prints them, with any note M85.33 takes from the headings above it.

Excludes

Conditions classified elsewhere.

  • Osteogenesis imperfecta (Q78.0)osteopetrosis (Q78.2)osteopoikilosis (Q78.8)polyostotic fibrous dysplasia (Q78.1)From M85 Other disorders of bone density and structure
  • 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 M85.3 Osteitis condensans
  • 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 M85.33 sits

  1. 1ChapterChapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99)
  2. 2Block M80-M94Osteopathies and chondropathies
  3. 3Block M80-M85Disorders of bone density and structure
  4. 4Category M85Other disorders of bone density and structure
  5. 5Subcategory M85.3Osteitis condensans
  6. 6Valid code M85.33Osteitis condensans, forearm

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 M85.33 in the CIHI source

Frequently asked questions

What does ICD-10-CA code M85.33 mean?

M85.33 is the ICD-10-CA code for “Osteitis condensans, forearm” in CIHI’s ICD-10-CA FY 2026–2027 release.

Where is M85.33 in ICD-10-CA?

M85.33 sits under M85.3 Osteitis condensans, within M85 Other disorders of bone density and structure, within M80-M85 Disorders of bone density and structure, within M80-M94 Osteopathies and chondropathies, within Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99).

What coding notes apply to M85.33?

ICD-10-CA lists Note, Excludes notes for M85.33, 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 M85.33

M85.30Osteitis condensans, multiple sitesM85.31Osteitis condensans, shoulder regionM85.32Osteitis condensans, upper armM85.34Osteitis condensans, handM85.35Osteitis condensans, pelvic region and thighM85.36Osteitis condensans, lower legM85.37Osteitis condensans, ankle and footM85.38Osteitis condensans, other siteM85.39Osteitis condensans, unspecified site