Question 1

Is H42 a billable ICD-10 code?

Accepted Answer

Yes, H42 is a valid billable ICD-10-CM code for glaucoma in diseases classified elsewhere. It can be used for medical billing and reimbursement purposes.

Question 2

What does ICD-10 code H42 mean?

Accepted Answer

ICD-10-CM code H42 represents Glaucoma in diseases classified elsewhere. This code is part of the International Classification of Diseases, 10th Revision, Clinical Modification used for medical coding and billing in the United States.

Question 3

When was ICD-10 code H42 introduced?

Accepted Answer

Code H42 has been part of ICD-10-CM since 2016, when the coding system was mandated for use in the United States. This code was included in the original US implementation.

Question 4

What is the parent category for ICD-10 code H42?

Accepted Answer

The parent category for H42 is section:H40-H42 (Glaucoma (H40-H42)). This hierarchical classification helps organize related diagnoses for more accurate coding.

Question 5

What conditions are excluded from H42?

Accepted Answer

Code H42 has Type 1 Excludes (mutually exclusive conditions) including: glaucoma (in) onchocerciasis (B73.02); glaucoma (in) syphilis (A52.71); glaucoma (in) tuberculous (A18.59) and 1 more conditions. These conditions cannot be coded together with H42 as they represent different diagnoses.

Question 6

Can H42 be used as principal diagnosis?

Accepted Answer

No, H42 is a manifestation code and cannot be used as the principal diagnosis. Manifestation codes describe a condition caused by an underlying disease. You must code the underlying condition first, then use H42 as a secondary diagnosis.

H422026

Excludes14Not coded together

Code First7Sequence another code first

Excludes211Not included here

Notes1Additional information

Also Known As10Alternative terms

Medicare Code Editor Rules1CMS coding restrictions

Related Clinical Codes20Manifestation & etiology relationships