K08.421 Partial loss of teeth due to periodontal diseases, class I

Billable ICD-10-CM code, FY2026.

Applies from K08 Other disorders of teeth and supporting structures

Excludes2 (not included here)

• dentofacial anomalies [including malocclusion] (M26.-)
• disorders of jaw (M27.-)

Applies from K08.4 Partial loss of teeth

Applicable to

• Acquired loss of teeth, partial

Excludes1 (never code together)

• complete loss of teeth (K08.1-)
• congenital absence of teeth (K00.0)

Excludes2 (not included here)

• exfoliation of teeth due to systemic causes (K08.0)

MS-DRG index

Defines the logic of DRG(s) 011-013 in MDC PRE.

Approximate ICD-9-CM (GEMs)

• 525.12 Loss of teeth due to periodontal disease (approximate)
• 525.51 Partial edentulism, class I (approximate)

Code annotations containing back-references to K08.421

Back-references to K08.4

• Type 1 Excludes: K08.1 Complete loss of teeth ("partial loss of teeth (K08.4-)")

Diagnosis Index entries for K08.421

• Absence (of) (organ or part) (complete or partial) › teeth, tooth (congenital) › acquired (complete) › partial › due to › periodontal disease › class I

Nearby codes

• K08.412 Partial loss of teeth due to trauma, class II
• K08.413 Partial loss of teeth due to trauma, class III
• K08.414 Partial loss of teeth due to trauma, class IV
• K08.419 Partial loss of teeth due to trauma, unspecified class
• K08.42 Partial loss of teeth due to periodontal diseases
• K08.421 Partial loss of teeth due to periodontal diseases, class I (this code)
• K08.422 Partial loss of teeth due to periodontal diseases, class II
• K08.423 Partial loss of teeth due to periodontal diseases, class III
• K08.424 Partial loss of teeth due to periodontal diseases, class IV
• K08.429 Partial loss of teeth due to periodontal diseases, unspecified class
• K08.43 Partial loss of teeth due to caries