M84.451K — Pathological fracture, right femur, subsequent encounter for fracture with nonunion
M84.451K is a billable, specific ICD-10-CM code for pathological fracture, right femur, subsequent encounter for fracture with nonunion. It is valid for submission on a claim.
7th character "K" — subsequent encounter for fracture with nonunion
The appropriate 7th character is to be added to each code from subcategory M84.4:
- 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
Excludes1 inherited from the categories above M84.451K
These are not written on M84.451K, but they bind it: a note on a category applies to every code beneath it. Billing M84.451K with anything listed here is a denial.
Written on M84.4 — Pathological fracture, not elsewhere classified
Excludes2 inherited from the categories above M84.451K
Also inherited, and the opposite of Excludes1: these conditions are not part of M84.451K, but a patient can have both, so you may code both.
Written on M84.4 — Pathological fracture, not elsewhere classified
- personal history of (healed) pathological fracture (Z87.311)
Written on M84 — Disorder of continuity of bone
- traumatic fracture of bone-see fracture, by site
Risk adjustment
M84.451K does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
M84.451K is named in 19 Medicare coverage policies — 12 listing it as supporting medical necessity, and 7 listing it as NOT covered. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A58865Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
- A58883Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
- A58893Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
- A59374Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
Code history
M84.451K has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share M84.451. If M84.451K is not quite right, the correct code is usually one of these.
- M84.451APathological fracture, right femur, initial encounter for fracture
- M84.451DPathological fracture, right femur, subsequent encounter for fracture with routine healing
- M84.451GPathological fracture, right femur, subsequent encounter for fracture with delayed healing
- M84.451PPathological fracture, right femur, subsequent encounter for fracture with malunion
- M84.451SPathological fracture, right femur, sequela
Questions about M84.451K
- Is M84.451K a billable ICD-10-CM code?
- Yes. M84.451K is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does M84.451K sit in the tabular list?
- Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Disorders of bone density and structure (M80-M85).
- What cannot be coded together with M84.451K?
- M84.451K carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above M84.451K (M84.4) and apply to it just the same.