ICD-10 Code for Irregular

The ICD-10-CM 2027 alphabetic index lists irregular, irregularity with the subterms below. More specific codes depend on the details documented, as listed in the official index (14 codes, 14 billable).

Index entries for Irregular

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

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.