ICD10BillableValid for clinical use
ICD-10 Code H26.40: Unspecified secondary cataract
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
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 secondary cataract 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
H25-H28Disorders of lens
category
H26Other cataract
category
H26.4Secondary cataract
currentH26.4
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 66821high
DISCISSION OF SECONDARY MEMBRANOUS CATARACT (OPACIFIED POSTERIOR LENS CAPSULE AND/OR ANTERIOR HYALOID); LASER SURGERY (EG, YAG LASER) (1 OR MORE STAGES)
Source: CMS coverage guidance
CPT 66820high
DISCISSION OF SECONDARY MEMBRANOUS CATARACT (OPACIFIED POSTERIOR LENS CAPSULE AND/OR ANTERIOR HYALOID); STAB INCISION TECHNIQUE (ZIEGLER OR WHEELER KNIFE)
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 66991high
EXTRACAPSULAR CATARACT REMOVAL WITH INSERTION OF INTRAOCULAR LENS PROSTHESIS (1 STAGE PROCEDURE), MANUAL OR MECHANICAL TECHNIQUE (EG, IRRIGATION AND ASPIRATION OR PHACOEMULSIFICATION); WITH INSERTION OF INTRAOCULAR (EG, TRABECULAR MESHWORK, SUPRACILIARY, SUPRACHOROIDAL) ANTERIOR SEGMENT AQUEOUS DRAINAGE DEVICE, WITHOUT EXTRAOCULAR RESERVOIR, INTERNAL APPROACH, ONE OR MORE
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 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
Coding guidelines
Common synonyms
Unspecified secondary cataract
Frequently asked questions
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.