Alphabetic Index FY2027

M87.37

Other secondary osteonecrosis, ankle and foot

FY2027Chapter 13: Diseases of the musculoskeletal system and connective tissue/M86–M90 Other osteopathies

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

M87.37 is a non-billable ICD-10-CM code header for other secondary osteonecrosis, ankle and foot. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are M87.371 Other secondary osteonecrosis, right ankle; M87.372 Other secondary osteonecrosis, left ankle; M87.373 Other secondary osteonecrosis, unspecified ankle; M87.374 Other secondary osteonecrosis, right foot and 5 more. Its coding notes include a Use additional code instruction, 3 Excludes1 entries and 10 Excludes2 entries.

Guidelines tip

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

When the lower or upper end of a bone is affected near a joint, the site is the bone, not the joint.

Guidelines I.C.13.a.1Site of bone conditions: bone, not jointRead the official text

Use additional code

Add the listed code as a secondary code, if known.

Inherited from M87 Osteonecrosis
  • code to identify major osseous defect, if applicable (M89.7-)

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Inherited from M87 Osteonecrosis
  • juvenile osteonecrosis (M91-M92)
  • osteochondropathies (M90-M93)
Also from chapter/block level (1 note)
Inherited from M86–M90 Other osteopathies
  • postprocedural osteopathies (M96.-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (10 notes)
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Includes

Further defines or gives examples of the content of the category.

Inherited from M87 Osteonecrosis
  • avascular necrosis of bone

Notes

Also from chapter/block level (1 note)
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 1 entry

More specific codes under M87.37 9