ICD-10-CM Alphabetic Index · FY 2026 24 Entries

Irregular in the ICD-10-CM Index ICD-10-CM

The main term Irregular, irregularity carries 24 index entries pointing to 14 ICD-10-CM codes. Every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.

✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026

Index Entries

Codes Referenced

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Letter

24 of 24 shown

ICD-10-CM

Index Entries Under Irregular 24 entries · 14 codes

Irregular, irregularity

action, heart I49.9

alveolar process K08.89

bleeding N92.6

breathing R06.89

contour of cornea (acquired) see Deformity, cornea

congenital Q13.4

contour, reconstructed breast N65.0

dentin (in pulp) K04.3

eye movements H55.89

deficient

saccadic H55.81

smooth H55.82

nystagmus see Nystagmus

labor O62.2

menstruation (cause unknown) N92.6

periods N92.6

prostate N42.9

pupil see Abnormality, pupillary

reconstructed breast N65.0

respiratory R06.89

septum (nasal) J34.2

shape, organ or site, congenital NEC see Distortion

sleep-wake pattern (rhythm) G47.23

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Related Index Terms

Deformity Nystagmus All index terms starting with I Index to Diseases and Injuries ICD-10-CM Code Lookup

Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.