ICD-10-CM 2027
ICD-10 code for molar fourth
From the official ICD-10-CM alphabetic index entry “Fourth › molar”. Page updated September 29, 2026.
About coding molar fourth
The ICD-10-CM code for molar fourth is K00.1 (Supernumerary teeth).
Within K00 (disorders of tooth development and eruption), K00.1 is specifically for Supernumerary teeth. Related codes cover Anodontia (K00.0), abnormalities of size and form of teeth (K00.2), Mottled teeth (K00.3), disturbances in tooth formation (K00.4), hereditary disturbances in tooth structure, not elsewhere classified (K00.5), disturbances in tooth eruption (K00.6), Teething syndrome (K00.7), other disorders of tooth development (K00.8) and 1 more.
The conditions in its Excludes2 note aren't part of K00.1, but may be coded alongside it if the patient has both: supernumerary roots (K00.2).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Common questions about molar fourth ICD-10 codes
What is the ICD-10 code for molar fourth?
- K00.1 — Supernumerary teeth.
Is K00.1 billable?
- Yes. K00.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K00.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K00.1 as a principal diagnosis.
Is K00.1 a CC or MCC?
- No. K00.1 is neither a CC nor an MCC under MS-DRG v44.0.