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M12.40 ICD-10-CA code: Intermittent hydrarthrosis, multiple sites

M12.40 is the ICD-10-CA code for “Intermittent hydrarthrosis, multiple sites” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.

Official description

M12.40

Intermittent hydrarthrosis, multiple sites

Short description: Intermittent hydrarthrosis multiple site

ICD-10-CA · Canada · Also written M1240

Notes for M12.40

As CIHI prints them, with any note M12.40 takes from the headings above it.

Includes

Excludes

Conditions classified elsewhere.

  • Arthropathy NOS (M13.9)arthrosis (M15-M19)cricoarytenoid arthropathy (J38.7)From M12 Other specific arthropathies
  • 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 M12.4 Intermittent hydrarthrosis
  • 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 M12.40 sits

  1. 1ChapterChapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99)
  2. 2Block M00-M25Arthropathies
  3. 3Block M05-M14Inflammatory polyarthropathies
  4. 4Category M12Other specific arthropathies
  5. 5Subcategory M12.4Intermittent hydrarthrosis
  6. 6Valid code M12.40Intermittent hydrarthrosis, multiple sites

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 M12.40 in the CIHI source

Frequently asked questions

What does ICD-10-CA code M12.40 mean?

M12.40 is the ICD-10-CA code for “Intermittent hydrarthrosis, multiple sites” in CIHI’s ICD-10-CA FY 2026–2027 release.

Where is M12.40 in ICD-10-CA?

M12.40 sits under M12.4 Intermittent hydrarthrosis, within M12 Other specific arthropathies, within 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 M12.40?

ICD-10-CA lists Note, Includes, Excludes notes for M12.40, 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 M12.40

M12.41Intermittent hydrarthrosis, shoulder regionM12.42Intermittent hydrarthrosis, upper armM12.43Intermittent hydrarthrosis, forearmM12.44Intermittent hydrarthrosis, handM12.45Intermittent hydrarthrosis, pelvic region and thighM12.46Intermittent hydrarthrosis, lower legM12.47Intermittent hydrarthrosis, ankle and footM12.48Intermittent hydrarthrosis, other siteM12.49Intermittent hydrarthrosis, unspecified site