M48.40XA
Fatigue fracture of vertebra, site unspecified, initial encounter for fracture
M48.40XA (also written M4840XA) is a billable ICD-10-CM diagnosis code for fatigue fracture of vertebra, site unspecified, initial encounter for fracture. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 119 codes in category M48 (Other spondylopathies). The Alphabetic Index lists it under 1 entry. Its 7th character, A, means initial encounter for fracture. Its coding notes include 5 Excludes1 entries and 10 Excludes2 entries.
7th character
Category M48.4 requires a 7th character. M48.40 has only 5 characters, so a placeholder X fills the 6th position.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (10 notes)
- 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)
Notes
Also from chapter/block level (1 note)
- 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 M48.40. This code adds the 7th character. 1 entry