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

Dr. Karl Michael Grimmer Jr., MD

Individual provider Anesthesiology Physician · NPI 1386842003

Dr. Karl Michael Grimmer Jr., MD practises Anesthesiology in Washington, District of Columbia. Graduated from Indiana University School of Medicine in 2007, 19 years ago. Practices with Anesthesia Company LLC, a 377-clinician group and accepts Medicare assignment. Licensed in District of Columbia, Indiana, Maryland and Virginia.

Years since qualifying
19
Trained at
Indiana University School of Medicine
Licensed in
DC, IN, MD, VA
In the registry since
2007
Specialties on file
4
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

50 Florida Ave NE Apt 511
Washington, DC 20002-6968
Phone: (219) 902-3878
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence MD041865 (DC)
Anesthesiology Physician Taxonomy 207L00000X · Licence D72351 (MD)
Anesthesiology Physician Taxonomy 207L00000X · Licence 101254955 (VA)
Anesthesiology Physician Taxonomy 207L00000X · Licence 01069743A (IN)

Record details

NPI number1386842003
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 3, 2007
Last updated in NPPESJanuary 18, 2025
Certification dateJanuary 18, 2025

Medicare enrollment

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

Medicare specialtyANESTHESIOLOGY
Medical schoolINDIANA UNIVERSITY SCHOOL OF MEDICINE
Graduated 2007 (19 years in practice)
Group practice Anesthesia Company Llc — 377 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 patients139
Services billed 152 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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $49 2 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Anesthesia Company LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 377 clinicians in the practice; 12 are shown here.

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