ICD-10-CM M27.40 is the diagnosis code for Unspecified cyst of jaw. This code falls under the section "Dentofacial anomalies [including malocclusion] and other disorders of jaw" within Chapter 13 — Diseases of the musculoskeletal system and connective tissue (M00-M99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Understanding where M27.40 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, M27.40 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
M27.40 is the ICD-10-CM diagnosis code for "Unspecified cyst of jaw". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of M27.40 is M27.4 ("Other and unspecified cysts of jaw"). M27.40 provides a more specific classification within this category.
M27.40 is located in Section M26-M27 — "Dentofacial anomalies [including malocclusion] and other disorders of jaw" within Chapter 13 of the ICD-10-CM Tabular List.
Use M27.40 when the patients documented diagnosis matches "Unspecified cyst of jaw" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Unspecified cyst of jaw is M27.40.
Yes, M27.40 can be used as a primary diagnosis code since it is billable and specific.
M27.40 is in Chapter 13 of the ICD-10-CM Tabular List.
Yes, M27.40 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.