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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.

CPT/HCPCS Code1
Descriptor
95012
Nitric oxide expired gas determination
A4617
Mouthpiece
99201-99205*
New patient office visit for the evaluation and management
99211-99215*
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.