M84.4
Pathological fracture, not elsewhere classified
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 18 never code together
M84.4code
Excludes1
- collapsed vertebra NEC (M48.5)M48.5M48.5
- pathological fracture in neoplastic disease (M84.5-)M84.5-M84.5-
- pathological fracture in osteoporosis (M80.-)M80.-M80.-
- pathological fracture in other disease (M84.6-)M84.6-M84.6-
- stress fracture (M84.3-)M84.3-M84.3-
- traumatic fracture (S12.-, S22.-, S32.-, S42.-, S52.-, S62.-, S72.-, S82.-, S92.-)S12.-S12.-S22.-S22.-S32.-S32.-S42.-S42.-S52.-S52.-S62.-S62.-S72.-S72.-S82.-S82.-S92.-S92.-
M84code
Excludes2
- traumatic fracture of bone-see fracture, by site
M00-M99chapter
Excludes2
- arthropathic psoriasis (L40.5-)L40.5-
- certain conditions originating in the perinatal period (P04-P96)P04-P96
- certain infectious and parasitic diseases (A00-B99)A00-B99
- compartment syndrome (traumatic) (T79.A-)T79.A-
- complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Q00-Q99
- endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
- injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
- neoplasms (C00-D49)C00-D49
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
7th character 6
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
Instructional notes 3
Index entries leading here filed at null
No alphabetic index entry points at this code.
Alongside this code 6 same parent — M84
M84.3 Stress fracture category M84.5 Pathological fracture in neoplastic disease category M84.6 Pathological fracture in other disease category M84.7 Nontraumatic fracture, not elsewhere classified category M84.8 Other disorders of continuity of bone category M84.9 Disorder of continuity of bone, unspecified
Subordinate codes 9
M84.40 Pathological fracture, unspecified site M84.41 Pathological fracture, shoulder M84.42 Pathological fracture, humerus M84.43 Pathological fracture, ulna and radius M84.44 Pathological fracture, hand and fingers M84.45 Pathological fracture, femur and pelvis M84.46 Pathological fracture, tibia and fibula M84.47 Pathological fracture, ankle, foot and toes M84.48 Pathological fracture, other site
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.