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

Johnnie Mao, MD

Individual provider Internal Medicine Physician · NPI 1710410071

Johnnie Mao, MD practises Internal Medicine in Bethlehem, Pennsylvania. Qualified in 2016, 10 years ago. Practices with Gslpg, Inc, a 267-clinician group and accepts Medicare assignment. Licensed in Pennsylvania.

Years since qualifying
10
Licensed in
PA
In the registry since
2017
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

801 Ostrum St
Bethlehem, PA 18015-1000
Phone: (484) 526-4658
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence MD470972 (PA)

Record details

NPI number1710410071
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 4, 2017
Last updated in NPPESMay 2, 2022
Certification dateMay 2, 2022

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2016 (10 years in practice)
Group practice Gslpg, Inc — 267 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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 patients422
Services billed 953 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

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. Those with a page here are linked.

Colleagues at Gslpg, Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 267 clinicians in the practice; 12 are shown here.

Other providers in Bethlehem