M26.35 identifies an anomaly of tooth position in which a fully erupted tooth or multiple fully erupted teeth are axially rotated out of their normal alignment within the dental arch.

Documentation tips

What should appear in the chart to support M26.35.

Source · Editorial brief grounded in 7 cited references ↓

• Specify that the affected tooth or teeth are fully erupted — without this, the M26.3x subcategory does not apply and the claim is exposed to query.
• Identify the rotated tooth by universal numbering system (e.g., tooth #7, #11) or arch position in the clinical note to support medical necessity for orthodontic or surgical intervention.
• Distinguish rotation (axial turn on long axis) from horizontal displacement (M26.33) or vertical displacement (M26.34) — the treatment approach and correct code differ.
• If crowding is also documented, add M26.31 as a secondary diagnosis; both codes may be reported together when both conditions are clinically present.
• Include supporting imaging findings (periapical radiograph, panoramic X-ray, CBCT) in the encounter note to substantiate the positional anomaly diagnosis.

Related CPT procedures

Procedure codes commonly billed with M26.35. Linking the right diagnosis to the right procedure is what establishes medical necessity.

Source · CMS LCDs · AAOS specialty guidance · claims-pattern analysis

Common coding pitfalls

The recurring mistakes coders make with M26.35 and adjacent codes.

Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓

• Billing M26.3 (the parent) instead of M26.35 — M26.3 is non-billable and will reject; always use the specific child code.
• Using M26.35 when the tooth is impacted or unerupted — impacted teeth belong under K01, not anywhere in M26.3.
• Defaulting to M26.30 (unspecified) when the provider's note clearly documents rotation — specificity is available and payers expect it.
• Omitting a secondary arch-relationship code (e.g., M26.31 crowding) when both conditions are documented, leaving reimbursement and clinical picture incomplete.
• Confusing tooth rotation with horizontal or vertical displacement — review the clinical description carefully before selecting M26.33, M26.34, or M26.35.

Clinical context

Source · Editorial summary grounded in 7 cited references ↓

Sibling codes

Other billable codes under M26.3 (laterality / anatomic variants).