Abnormal excess space between fully erupted permanent teeth, including diastema (gap between teeth) not otherwise specified.
Verified May 8, 2026 · 4 sources ↓
- Status
- Billable
- Chapter
- 13
- Related CPT
- 0
- Region
- Other
Documentation tips
What should appear in the chart to support M26.32.
Source · Editorial brief grounded in 4 cited references ↓
- Provider must specify that teeth involved are fully erupted — M26.32 does not apply to partially erupted or impacted teeth.
- Document 'diastema,' 'excessive spacing,' or 'gap between teeth' explicitly; vague terms like 'tooth anomaly' will not support M26.32 over the unspecified M26.30.
- Record which teeth or tooth region is affected (e.g., maxillary central incisors, anterior dentition) to support clinical specificity and any associated procedure justification.
- If spacing is secondary to a systemic or connective tissue condition, document that relationship — a code-also or etiology note may be required by the payer.
- For medical insurance coverage of orthodontic or surgical correction, include documentation of functional impairment (speech, mastication) associated with the spacing.
Common coding pitfalls
The recurring mistakes coders make with M26.32 and adjacent codes.
Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓
- Coding M26.32 for partially erupted or unerupted teeth — the code is restricted to fully erupted dentition; use M26.30 or a more appropriate M26 subcategory otherwise.
- Confusing M26.32 (interproximal/horizontal spacing) with M26.37 (excessive interocclusal distance, a vertical gap between opposing arches) — they describe different anatomical relationships.
- Using parent code M26.3 instead of the billable M26.32 — M26.3 is a non-billable header code and will be rejected for claim submission.
- Failing to distinguish diastema from horizontal displacement (M26.33); diastema is a spacing gap, not a lateral shift of tooth position.
Clinical context
Source · Editorial summary grounded in 4 cited references ↓
M26.32 is the correct code when a provider documents excessive spacing, gaps, or diastema between fully erupted teeth as a dentofacial anomaly. It falls under parent code M26.3 (Anomalies of tooth position of fully erupted tooth or teeth) within the M26 Dentofacial anomalies block. The 'Applicable To' note in the tabular list explicitly includes 'Diastema of fully erupted tooth or teeth NOS,' so diastema documented without further specificity maps here.
This code is used most commonly in oral and maxillofacial surgery (OMFS) and orthodontic-adjacent settings where dentofacial anomalies drive surgical or prosthetic planning. It may appear as a primary diagnosis when spacing itself is the presenting problem, or as a secondary diagnosis supporting procedures such as orthognathic surgery or restorative dental work billed under medical coverage.
Do not confuse M26.32 with adjacent positional anomaly codes: M26.31 covers crowding (the opposite condition), M26.33 covers horizontal displacement, and M26.37 covers excessive interocclusal distance — a vertical rather than interproximal spacing issue. If spacing is unspecified or documented ambiguously, M26.30 (unspecified anomaly of tooth position) is the fallback, but M26.32 should be used whenever the provider documents spacing excess or diastema explicitly.
Inclusion & exclusion notes
Per the official ICD-10-CM Tabular List.
Source · CDC ICD-10-CM Official Tabular List · 2026
Includes
- Diastema of fully erupted tooth or teeth NOS
Sibling codes
Other billable codes under M26.3 (laterality / anatomic variants).
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 4 cited references ↓
01Is M26.32 billable on its own, or does it require a primary diagnosis?
02Does M26.32 cover diastema between the maxillary central incisors specifically?
03What is the difference between M26.32 and M26.37?
04Can M26.32 be used for a patient with a connective tissue disorder causing tooth spacing?
05When should M26.30 be used instead of M26.32?
06Is M26.32 appropriate for pediatric patients with primary (baby) teeth?
Sources & references
Editorial content was developed using the following public sources. Last verified May 8, 2026.
- 01CDC ICD-10-CM Tabular List 2026 (effective Oct 1, 2025)
- 02icd10data.comhttps://www.icd10data.com/ICD10CM/Codes/M00-M99/M26-M27/M26-/M26.32
- 03aapc.comhttps://www.aapc.com/codes/icd-10-codes/M26.32
- 04vsac.nlm.nih.govhttps://vsac.nlm.nih.gov/context/cs/codesystem/ICD10CM/version/2023/code/M26.32/info
Mira AI Scribe
Mira's AI scribe captures the provider's explicit language — 'diastema,' 'gap,' or 'excessive spacing' — along with confirmation that the affected teeth are fully erupted and identification of the tooth region involved. This prevents a drop to the unspecified M26.30, which can trigger payer requests for additional documentation or denial of medically necessary orthodontic or surgical benefits.
See how Mira captures M26.32 documentation