M27.4 Other and unspecified cysts of jaw

Not billable (header)Chapter 13

Report one of the more specific codes below.

Check coverage with this diagnosis

Codes under this one

M27.40 Unspecified cyst of jaw
M27.49 Other cysts of jaw

Instructional notes

Chapter 13

Excludes2Not included here: the patient may have both; report both when both are present.

arthropathic psoriasis (L40.5-)
certain conditions originating in the perinatal period (P04-P96)
certain infectious and parasitic diseases (A00-B99)
compartment syndrome (traumatic) (T79.A-)
complications of pregnancy, childbirth and the puerperium (O00-O9A)
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
endocrine, nutritional and metabolic diseases (E00-E88)
injury, poisoning and certain other consequences of external causes (S00-T88)
neoplasms (C00-D49)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Notes

Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Section M26-M27

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.

hemifacial atrophy or hypertrophy (Q67.4)
unilateral condylar hyperplasia or hypoplasia (M27.8)

This code

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.

cysts of oral region (K09.-)
latent bone cyst of jaw (M27.0)
Stafne's cyst (M27.0)

Chapter 13: Diseases of the musculoskeletal system and connective tissue · M26-M27 Dentofacial anomalies [including malocclusion] and other disorders of jaw (M26-M27)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.