Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Stephen M Lyon, DO

Individual provider Emergency Medicine Physician · NPI 1205180387

Stephen M Lyon, DO practises Emergency Medicine in Portsmouth, Ohio. Qualified in 2012, 14 years ago. Practices with Acs Primary Care Physicians Southwest PA, a 188-clinician group and accepts Medicare assignment. Licensed in Ohio.

Years since qualifying
14
Licensed in
OH
In the registry since
2012
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

1805 27th St
Portsmouth, OH 45662-2640 Not confirmed with CMS for 13 years — call before visiting
Phone: (740) 356-5000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 58004665 (OH)

Record details

NPI number1205180387
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedOctober 29, 2012
Last updated in NPPESOctober 29, 2012

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolOTHER
Graduated 2012 (14 years in practice)
Group practice Acs Primary Care Physicians Southwest Pa — 188 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients656
Services billed 736 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Acs Primary Care Physicians Southwest PA

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 188 clinicians in the practice; 12 are shown here.

Other providers in Portsmouth