Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Margaret S Tretter, DO, FACP

Individual provider Internal Medicine Physician · NPI 1477550382

Margaret S Tretter, DO, FACP is an Internal Medicine Physician in Allentown, Pennsylvania. Licensed in Pennsylvania. Registered with an NPI since 2005.

Licensed in
PA
In the registry since
2005
Specialties on file
3
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.
FACP — Fellow of the American College of Physicians
An internist admitted as a fellow of the ACP.

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Practice location Address checks out

1255 S Cedar Crest Blvd Ste 2200
Allentown, PA 18103-6256
Phone: (610) 437-9006
Fax: (610) 437-1942
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence OS005189L (PA)
Internal Medicine Physician Taxonomy 207R00000X · Licence OS005189L (PA)
Geriatric Medicine (Internal Medicine) Physician Taxonomy 207RG0300X · Licence OS005189L (PA)

Record details

NPI number1477550382
Entity typeIndividual (Type 1)
GenderFemale
Credentials DO , FACP
Sole proprietorNo
NPI enumeratedJuly 7, 2005
Last updated in NPPESFebruary 9, 2021
Certification dateFebruary 9, 2021

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