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ICD10BillableValid for clinical use

ICD-10 Code H21.9: Unspecified disorder of iris and ciliary body

H21.9 is a billable ICD-10 diagnosis code used to classify Unspecified disorder of iris and ciliary body in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the eye and adnexa (H00-H59).

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the eye and adnexa (H00-H59).

When is it used?

  • May be used when a clinician documents unspecified disorder of iris and ciliary body in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter
7Diseases of the eye and adnexa (H00-H59)
block
H15-H22Disorders of sclera, cornea, iris and ciliary body
category
H21Other disorders of iris and ciliary body
currentH21

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

Ophthalmologist

Coverage-related procedures and services

CPT 66987high
EXTRACAPSULAR CATARACT REMOVAL WITH INSERTION OF INTRAOCULAR LENS PROSTHESIS (1-STAGE PROCEDURE), MANUAL OR MECHANICAL TECHNIQUE (EG, IRRIGATION AND ASPIRATION OR PHACOEMULSIFICATION), COMPLEX, REQUIRING DEVICES OR TECHNIQUES NOT GENERALLY USED IN ROUTINE CATARACT SURGERY (EG, IRIS EXPANSION DEVICE, SUTURE SUPPORT FOR INTRAOCULAR LENS, OR PRIMARY POSTERIOR CAPSULORRHEXIS) OR PERFORMED ON PATIENTS IN THE AMBLYOGENIC DEVELOPMENTAL STAGE; WITH ENDOSCOPIC CYCLOPHOTOCOAGULATION
Source: CMS coverage guidance
CPT 66982high
EXTRACAPSULAR CATARACT REMOVAL WITH INSERTION OF INTRAOCULAR LENS PROSTHESIS (1-STAGE PROCEDURE), MANUAL OR MECHANICAL TECHNIQUE (EG, IRRIGATION AND ASPIRATION OR PHACOEMULSIFICATION), COMPLEX, REQUIRING DEVICES OR TECHNIQUES NOT GENERALLY USED IN ROUTINE CATARACT SURGERY (EG, IRIS EXPANSION DEVICE, SUTURE SUPPORT FOR INTRAOCULAR LENS, OR PRIMARY POSTERIOR CAPSULORRHEXIS) OR PERFORMED ON PATIENTS IN THE AMBLYOGENIC DEVELOPMENTAL STAGE; WITHOUT ENDOSCOPIC CYCLOPHOTOCOAGULATION
Source: CMS coverage guidance
CPT 92285high
EXTERNAL OCULAR PHOTOGRAPHY WITH INTERPRETATION AND REPORT FOR DOCUMENTATION OF MEDICAL PROGRESS (EG, CLOSE-UP PHOTOGRAPHY, SLIT LAMP PHOTOGRAPHY, GONIOPHOTOGRAPHY, STEREO-PHOTOGRAPHY)
Source: CMS coverage guidance
CPT 66988high
EXTRACAPSULAR CATARACT REMOVAL WITH INSERTION OF INTRAOCULAR LENS PROSTHESIS (1 STAGE PROCEDURE), MANUAL OR MECHANICAL TECHNIQUE (EG, IRRIGATION AND ASPIRATION OR PHACOEMULSIFICATION); WITH ENDOSCOPIC CYCLOPHOTOCOAGULATION
Source: CMS coverage guidance
CPT 66984high
EXTRACAPSULAR CATARACT REMOVAL WITH INSERTION OF INTRAOCULAR LENS PROSTHESIS (1 STAGE PROCEDURE), MANUAL OR MECHANICAL TECHNIQUE (EG, IRRIGATION AND ASPIRATION OR PHACOEMULSIFICATION); WITHOUT ENDOSCOPIC CYCLOPHOTOCOAGULATION
Source: CMS coverage guidance
CPT 66983high
INTRACAPSULAR CATARACT EXTRACTION WITH INSERTION OF INTRAOCULAR LENS PROSTHESIS (1 STAGE PROCEDURE)
Source: CMS coverage guidance

Coding guidelines

Compatibility

Legacy and official ICD code match exactly.
Legacy codes
H21.9

Common synonyms

Unspecified disorder of iris and ciliary body

Frequently asked questions

Code details

CodeH21.9
SystemICD10
Display nameUnspecified disorder of iris and ciliary body
ChapterDiseases of the eye and adnexa (H00-H59)
BlockDisorders of sclera, cornea, iris and ciliary body

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
Disease, diseasedDisease, diseasedDisease, diseasedDisease, diseasedDisease, diseasedDisease, diseasedDisorder(of)Paralysis, paralytic(complete) (incomplete)

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.