Is M27 a billable ICD-10-CM code?

No. M27 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does M27 sit in the tabular list?

Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Dentofacial anomalies [including malocclusion] and other disorders of jaw (M26-M27).

M27

M27 — Other diseases of jaws

Non-billable headerICD-10-CM

M27 is a non-billable header ICD-10-CM code for other diseases of jaws. It cannot be billed on its own: choose one of the more specific child codes below.

Other codes that can never be billed with M27

These codes carry an Excludes1 note pointing at M27. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading M27 alone.

M27.4Other and unspecified cysts of jaw
M85.6Other cyst of bone

Risk adjustment

M27 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 M27

9 child codes. Green means billable.

Questions about M27

Is M27 a billable ICD-10-CM code?: No. M27 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does M27 sit in the tabular list?: Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Dentofacial anomalies [including malocclusion] and other disorders of jaw (M26-M27).