PEFR (Peak Expiratory Flow Rate)

Can anyone help me out on how to bill PEFR?
Is below mentioned codes are correct and will insurance pay for PEFR and Spirometry? What is the average reimbersement?

HCPCS Codes Description
S8110 Peak expiratory flow rate (physician services)
A4614 Peak expiratory flow rate meter, hand held
S8096 Portable peak flow meter
S8097 Asthma kit (including but not limited to portable peak expiratory flow meter, instructional video, brochure, and/or spacer)

Thank you in advance for your suggestions.