M84.345A

Stress fracture, left finger(s), initial encounter for fracture

Billable code

This code does not map to a risk-adjusting HCC in the loaded models.

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

Inherited from M84.3Stress fracture

Excludes 1

pathological fracture NOS (M84.4.-) pathological fracture due to osteoporosis (M80.-) traumatic fracture (S12.-, S22.-, S32.-, S42.-, S52.-, S62.-, S72.-, S82.-, S92.-)

Excludes 2

personal history of (healed) stress (fatigue) fracture (Z87.312) stress fracture of vertebra (M48.4-)

Use additional

external cause code(s) to identify the cause of the stress fracture

Synonyms

Fatigue fracture March fracture Stress fracture NOS Stress reaction

7th character

The appropriate 7th character is to be added to each code from subcategory M84.3:

Valid 7th characters and their meanings
Character	Meaning
A	initial encounter for fracture
D	subsequent encounter for fracture with routine healing
G	subsequent encounter for fracture with delayed healing
K	subsequent encounter for fracture with nonunion
P	subsequent encounter for fracture with malunion
S	sequela

Inherited from M84Disorder of continuity of bone

Excludes 2

traumatic fracture of bone-see fracture, by site

Inherited from chapter 13Diseases of the musculoskeletal system and connective tissue

Excludes 2

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)

Note

Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition (M00-M25) Arthropathies (M00-M25) Includes: Disorders affecting predominantly peripheral (limb) joints (M40-M54) Dorsopathies (M40-M54) (M60-M79) Soft tissue disorders (M60-M79) (M80-M94) Osteopathies and chondropathies (M80-M94)

Official Guidelines for M84.345A

FY 2026 ›

I.C.13Chapter-specific guidanceChapter 13: Diseases of the Musculoskeletal System and Connective

Subsections

Sections that reference M84.345A

I.C.2.l.6)Pathologic fracture due to a neoplasmChapter 2
… is for a pathological fracture due to a neoplasm, and the focus of treatment is the fracture, a code from subcategory M84.5, Pathological fracture in neoplastic disease, should be sequenced first, followed by the code for the neoplasm. …

Sections whose FY 2026 text names M84.345A, its M84 category, or a range containing it — the chapter guidance above is the authoritative source.