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

Adam Klein, DO

Individual provider Internal Medicine Physician · NPI 1245686641

Adam Klein, DO is registered under Infectious Disease in Bethesda, Maryland. Qualified in 2016, 10 years ago. Practices with Medstar Medical Group II LLC, a 3,717-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in District of Columbia, Maryland, New Jersey and Texas.

Years since qualifying
10
Licensed in
DC, MD, NJ, TX
In the registry since
2016
Specialties on file
4
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

8600 Old Georgetown Rd
Bethesda, MD 20814-1422
Phone: (301) 896-7500
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 5215 Loughboro Rd Nw, Washington, DC 20016-2618 — (202) 660-5182
  • 1001 Briggs Rd Ste 250, Mount Laurel, NJ 08054-4111 — (856) 866-7466
  • 200 Bowman Dr Ste E335, Voorhees, NJ 08043-9640 — (856) 247-7545

Specialties & licences

Infectious Disease Physician (primary) Taxonomy 207RI0200X · Licence H0097291 (MD)
Internal Medicine Physician Taxonomy 207R00000X · Licence BP10056889 (TX)
Infectious Disease Physician Taxonomy 207RI0200X · Licence DO034818 (DC)
Infectious Disease Physician Taxonomy 207RI0200X · Licence 25MB11105300 (NJ)

Record details

NPI number1245686641
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedMay 4, 2016
Last updated in NPPESOctober 3, 2025
Certification dateOctober 3, 2025

Medicare enrollment

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

Medicare specialtyINFECTIOUS DISEASE
Medical schoolOTHER
Graduated 2016 (10 years in practice)
Group practice Medstar Medical Group Ii Llc — 3717 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 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 patients216
Services billed 520 a service is one billed item, such as a visit, a test or a procedure
Average patient age68

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 Medstar Medical Group II LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3717 clinicians in the practice; 12 are shown here.

Other providers in Bethesda