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H21.543

H21.543: Posterior synechiae (iris), bilateral

Billable / specific codeICD-10-CMbilateral

H21.543 is a billable, specific ICD-10-CM code for posterior synechiae (iris), bilateral. It is valid for submission on a claim.

Check H21.543 with the rest of the claim: free scrubber

Excludes1 inherited from the categories above H21.543

A category’s note binds every code beneath it.

Written on H21.5: Other and unspecified adhesions and disruptions of iris and ciliary body

Excludes2 inherited from the categories above H21.543

Not part of this code, but both may be coded when both are present.

Written on H21: Other disorders of iris and ciliary body

  • sympathetic uveitis (H44.1-)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

H21.543 is named in 7 Medicare coverage policies: 7 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

  • A53060Billing and Coding: Ophthalmology: Extended Ophthalmoscopy and Fundus Photography
  • A56537Billing and Coding: Scanning Computerized Ophthalmic Diagnostic Imaging (SCODI)
  • A56726Billing and Coding: Ophthalmology: Posterior Segment Imaging (Extended Ophthalmoscopy and Fundus Photography)
  • A57068Billing and Coding: Ocular Photography - External

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under H21.54

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.