M84.66
Pathological fracture in other disease, tibia and fibula
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 12 never code together
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 2
Index entries leading here 1
Alongside this code 8 same parent — M84.6
M84.60 Pathological fracture in other disease, unspecified site category M84.61 Pathological fracture in other disease, shoulder category M84.62 Pathological fracture in other disease, humerus category M84.63 Pathological fracture in other disease, ulna and radius category M84.64 Pathological fracture in other disease, hand category M84.65 Pathological fracture in other disease, pelvis and femur category M84.67 Pathological fracture in other disease, ankle and foot category M84.68 Pathological fracture in other disease, other site category
Subordinate codes 5
M84.661 Pathological fracture in other disease, right tibia M84.662 Pathological fracture in other disease, left tibia M84.663 Pathological fracture in other disease, right fibula M84.664 Pathological fracture in other disease, left fibula M84.669 Pathological fracture in oth disease, unsp tibia and fibula
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.