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Coding Guides

FeNO Monitoring CPT/HCPCS Codes

Here is a sample of the coding reference guide for healthcare providers billing for FeNO monitoring and related services.

Nitric oxide expired gas determination
New patient office visit for the evaluation and management
Established patient office visit for the evaluation and management

*Use of these codes requires the appropriate use of modifiers. If an E&M code is reported with CPT 95012, the 25 modifier must be appended.

FeNO and Asthma Coding Guides

For full FeNO or asthma ICD-10 coding reference guides, please download the PDFs below.

FeNO CPT Coding Reference Guide

ICD-10-CM Asthma Diagnosis Coding


References: 1. Data on file. Circassia Pharmaceuticals Inc. April 2019 2. 2018 Payer Sheet. Data on File. Circassia Pharmaceuticals Inc. April 2018 3. CMS Medicare Fee Schedule (state reimbursement rate fluctuates based on regional Medicare contracts) Accessed October 3, 2019. 4. State Medicaid Fee Schedule (reimbursement rate fluctuates based on MCO contracts) Accessed October 3, 2019.