Is H21.9 a billable ICD-10-CM code?

Yes. H21.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does H21.9 sit in the tabular list?

Diseases of the eye and adnexa (H00-H59), in the block Disorders of sclera, cornea, iris and ciliary body (H15-H22).

H21.9

H21.9 — Unspecified disorder of iris and ciliary body

Billable / specific codeICD-10-CM

H21.9 is a billable, specific ICD-10-CM code for unspecified disorder of iris and ciliary body. It is valid for submission on a claim.

Risk adjustment

H21.9 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

H21.9 is named in 6 Medicare coverage policies — 6 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A56453Billing and Coding: Cataract Extraction
A56544Billing and Coding: Cataract Extraction
A57068Billing and Coding: Ocular Photography - External
A57071Billing and Coding: Ophthalmology: Posterior Segment Imaging (Extended Ophthalmoscopy and Fundus Photography)

How H21.9 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to H21.9.

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

Related codes at this level

Codes that share H21. If H21.9 is not quite right, the correct code is usually one of these.

Questions about H21.9

Is H21.9 a billable ICD-10-CM code?: Yes. H21.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does H21.9 sit in the tabular list?: Diseases of the eye and adnexa (H00-H59), in the block Disorders of sclera, cornea, iris and ciliary body (H15-H22).