M84.529K Pathological fracture in neoplastic disease, unspecified humerus, subsequent encounter for fracture with nonunion

Billable ICD-10-CM code, FY2026.

Built from M84.529 with 7th character K (subsequent encounter for fracture with nonunion).

Applies from M84 Disorder of continuity of bone

Excludes2 (not included here)

• traumatic fracture of bone-see fracture, by site

Applies from M84.5 Pathological fracture in neoplastic disease

Code also

• underlying neoplasm

7th character note

• The appropriate 7th character is to be added to each code from subcategory M84.5:

7th character required

• 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

Medicare Code Edits (MCE v43.1 (April 2026))

• Unspecified code (laterality): Unspecified codes for which a more specific code identifying laterality (right, left, bilateral) exists within the same code family.

Code annotations containing back-references to M84.529K

Back-references to M84.5

• Type 1 Excludes: M84.4 Pathological fracture, not elsewhere classified ("pathological fracture in neoplastic disease (M84.5-)")

Nearby codes

• M84.522S Pathological fracture in neoplastic disease, left humerus, sequela
• M84.529 Pathological fracture in neoplastic disease, unspecified humerus
• M84.529A Pathological fracture in neoplastic disease, unspecified humerus, initial encounter for fracture
• M84.529D Pathological fracture in neoplastic disease, unspecified humerus, subsequent encounter for fracture with routine healing
• M84.529G Pathological fracture in neoplastic disease, unspecified humerus, subsequent encounter for fracture with delayed healing
• M84.529K Pathological fracture in neoplastic disease, unspecified humerus, subsequent encounter for fracture with nonunion (this code)
• M84.529P Pathological fracture in neoplastic disease, unspecified humerus, subsequent encounter for fracture with malunion
• M84.529S Pathological fracture in neoplastic disease, unspecified humerus, sequela
• M84.53 Pathological fracture in neoplastic disease, ulna and radius
• M84.531 Pathological fracture in neoplastic disease, right ulna
• M84.531A Pathological fracture in neoplastic disease, right ulna, initial encounter for fracture