H21.9 — Unspecified disorder of iris and ciliary body

BillableUnspecified

Is H21.9 billable?

Yes, but H21.9 is an unspecified code. H21.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, H21.9 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting H21.9 — the more specific alternatives are listed below.

More specific alternatives

H21.9 at a glance

Code	H21.9
Description	Unspecified disorder of iris and ciliary body
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Which MS-DRGs does H21.9 group to?

H21.9 sits in MDC 02 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

124Other Disorders of the Eye with MCC or Thrombolytic Agentmedical
125Other Disorders of the Eye without MCCmedical

How is H21.9 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to H21.9. They show the wording a clinician may have documented, which often differs from the Tabular description.

Disease, diseased › aqueous
Disease, diseased › ciliary body
Disease, diseased › iris
Disease, diseased › uveal tract
Disorder › iris (of)
Disease, diseased › anterior › chamber
Disease, diseased › eye › anterior chamber
Paralysis, paralytic › muscle, muscular NEC › iris sphincter (complete) (incomplete)

Excludes2 — not included here — inherited from Chapter 7

The conditions below are not part of H21.9, but a patient may have both at the same time. When documentation supports it, H21.9 and the excluded code may both be reported.

certain conditions originating in the perinatal period (P04-P96)
certain infectious and parasitic diseases (A00-B99)
complications of pregnancy, childbirth and the puerperium (O00-O9A)
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
diabetes mellitus related eye conditions (E09.3-, E10.3-, E11.3-, E13.3-)
endocrine, nutritional and metabolic diseases (E00-E88)
injury (trauma) of eye and orbit (S05.-)
injury, poisoning and certain other consequences of external causes (S00-T88)
neoplasms (C00-D49)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
syphilis related eye disorders (A50.01, A50.3-, A51.43, A52.71)

Excludes2 — not included here — inherited from H21

The conditions below are not part of H21.9, but a patient may have both at the same time. When documentation supports it, H21.9 and the excluded code may both be reported.

sympathetic uveitis (H44.1-)

How long has H21.9 existed?

H21.9 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.