Is M84.66 a billable ICD-10-CM code?

No. M84.66 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does M84.66 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).

M84.66

M84.66 — Pathological fracture in other disease, tibia and fibula

Non-billable headerICD-10-CM

M84.66 is a non-billable header ICD-10-CM code for pathological fracture in other disease, tibia and fibula. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.

This code requires a 7th character

The appropriate 7th character is to be added to each code from subcategory M84.6:

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

Risk adjustment

M84.66 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.

Code to one of these instead M84.66

5 child codes. Green means billable.

Related codes at this level

Codes that share M84.6. If M84.66 is not quite right, the correct code is usually one of these.

Questions about M84.66

Is M84.66 a billable ICD-10-CM code?: No. M84.66 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does M84.66 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).