DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

K00 Disorders of tooth development and eruption

  • Header · not billable

K00 is not billable. The category heads 10 billable codes in FY2027: the 10 codes directly below it.

Index → code

Where it sits

  1. Chapter 11 Diseases of the digestive system (K00-K95)
  2. K00-K14 Diseases of oral cavity and salivary glands (K00-K14)
  3. K00 Disorders of tooth development and eruption
Billable codes
10
Subdivisions
10
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
99

Codes in K00

  1. K00.0
    Anodontia
    Billable
    Inclusion terms 2, Excludes1 1

    Inclusion terms

    • Hypodontia
    • Oligodontia

    Excludes1

    • acquired absence of teeth (K08.1-) K08.1
  2. K00.1
    Supernumerary teeth
    Billable
    Inclusion terms 5, Excludes2 1

    Inclusion terms

    • Distomolar
    • Fourth molar
    • Mesiodens
    • Paramolar
    • Supplementary teeth

    Excludes2

    • supernumerary roots (K00.2) K00.2
  3. K00.2
    Abnormalities of size and form of teeth
    Billable
    Inclusion terms 13, Excludes1 2

    Inclusion terms

    • Concrescence of teeth
    • Fusion of teeth
    • Gemination of teeth
    • Dens evaginatus
    • Dens in dente
    • Dens invaginatus
    • Enamel pearls
    • Macrodontia
    • Microdontia
    • Peg-shaped [conical] teeth
    • Supernumerary roots
    • Taurodontism
    • Tuberculum paramolare

    Excludes1

    • abnormalities of teeth due to congenital syphilis (A50.5) A50.5
    • tuberculum Carabelli, which is regarded as a normal variation and should not be coded
  4. K00.3
    Mottled teeth
    Billable
    Inclusion terms 3, Excludes2 1

    Inclusion terms

    • Dental fluorosis
    • Mottling of enamel
    • Nonfluoride enamel opacities

    Excludes2

    • deposits [accretions] on teeth (K03.6) K03.6
  5. K00.4
    Disturbances in tooth formation
    Billable
    Inclusion terms 5, Excludes1 1, Excludes2 1

    Inclusion terms

    • Aplasia and hypoplasia of cementum
    • Dilaceration of tooth
    • Enamel hypoplasia (neonatal) (postnatal) (prenatal)
    • Regional odontodysplasia
    • Turner's tooth

    Excludes1

    • Hutchinson's teeth and mulberry molars in congenital syphilis (A50.5) A50.5

    Excludes2

    • mottled teeth (K00.3) K00.3
  6. K00.5
    Hereditary disturbances in tooth structure, not elsewhere classified
    Billable
    Inclusion terms 5

    Inclusion terms

    • Amelogenesis imperfecta
    • Dentinogenesis imperfecta
    • Odontogenesis imperfecta
    • Dentinal dysplasia
    • Shell teeth
  7. K00.6
    Disturbances in tooth eruption
    Billable
    Inclusion terms 7, Excludes2 1

    Inclusion terms

    • Dentia praecox
    • Natal tooth
    • Neonatal tooth
    • Premature eruption of tooth
    • Premature shedding of primary [deciduous] tooth
    • Prenatal teeth
    • Retained [persistent] primary tooth

    Excludes2

    • embedded and impacted teeth (K01.-) K01
  8. K00.7
    Teething syndrome
    Billable
  9. K00.8
    Other disorders of tooth development
    Billable
    Inclusion terms 2, Excludes2 1

    Inclusion terms

    • Color changes during tooth formation
    • Intrinsic staining of teeth NOS

    Excludes2

    • posteruptive color changes (K03.7) K03.7
  10. K00.9
    Disorder of tooth development, unspecified
    Billable
    Inclusion terms 1

    Inclusion terms

    • Disorder of odontogenesis NOS

Sources of each column.

Instructions

At K00

Excludes2

  • embedded and impacted teeth (K01.-) K01

Notes that also apply

Chapter 11 instructions (Excludes2 8): printed on the chapter 11 page.

Index entries

  • Anodontia (complete) (partial) (vera) → K00.0
  • Distomolar (fourth molar) → K00.1
  • Mesiodens, mesiodentes → K00.1
  • Paramolar → K00.1
  • Supplemental teeth → K00.1
  • Concrescence (teeth) → K00.2
  • Dens evaginatus, in dente or invaginatus → K00.2
  • Dichotomy, teeth → K00.2
  • Enamel pearls → K00.2
  • Enameloma → K00.2
  • Gemination, tooth, teeth → K00.2
  • Macrodontia → K00.2
  • Microdontia → K00.2
  • Molarization of premolars → K00.2
  • Peg-shaped teeth → K00.2
  • Predeciduous teeth → K00.2
  • Premolarization, cuspids → K00.2
  • Schizodontia → K00.2
  • Shovel-shaped incisors → K00.2
  • Spicule tooth → K00.2
  • Synodontia → K00.2
  • Taurodontism → K00.2
  • T-shaped incisors → K00.2
  • Twinning, teeth → K00.2
  • Mottled, mottling, teeth (enamel) (endemic) (nonendemic) → K00.3
  • Dilaceration, tooth → K00.4
  • Odontodysplasia, regional → K00.4
  • Amelogenesis imperfecta → K00.5
  • Brown enamel of teeth (hereditary) → K00.5
  • Dentinogenesis imperfecta → K00.5
  • Odontogenesis imperfecta → K00.5
  • Opalescent dentin (hereditary) → K00.5
  • Shell teeth → K00.5
  • Dentia praecox → K00.6
  • Natal tooth, teeth → K00.6
  • Dentition (syndrome) → K00.7
  • Teething (syndrome) → K00.7
  • Pre-eruptive color change, teeth, tooth → K00.8
  • Absence (of) (organ or part) (complete or partial)teeth, tooth (congenital) → K00.0
  • Deficiency, deficienttooth bud → K00.0

59 more, longer entries are not listed; the search box finds them by word.

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