DR. KARL MICHAEL GRIMMER JR. MD
NPI 1386842003
Anesthesiology in Washington, DC
About Dr. Karl Michael Grimmer Jr. Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. KARL MICHAEL GRIMMER JR. MD (NPI 1386842003) is an individual anesthesiology provider in Washington, District Of Columbia, licensed in District Of Columbia (MD041865) and active in the NPI registry since July 2007. He is enrolled in Medicare PECOS, is affiliated with Tidalhealth Peninsula Regional, Inc, and is a graduate of Indiana University School Of Medicine (2007).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Karl Michael Grimmer Jr. Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
4Medicare enrollment records show Karl Grimmer reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Washington, DC 20016
- Reassigned Medicare billing, District of Columbia enrollment
- 127 clinicians in this Medicare group
Columbia, MD 21046
- Reassigned Medicare billing, District of Columbia and Maryland enrollments
- 717 clinicians in this Medicare group
Annapolis, MD 21401
- Reassigned Medicare billing, Delaware and Maryland enrollments
- 46 clinicians in this Medicare group
Salisbury, MD 21801
- Reassigned Medicare billing, Maryland enrollment
- 531 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 2
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Tidalhealth Peninsula Regional, Inc
Acute Care Hospitals · Salisbury, MDAtlantic General Hospital
Acute Care Hospitals · Berlin, MDMedicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Karl Grimmer's NPI number?
The NPI number for Karl Grimmer is 1386842003. It was assigned to this individual provider in the NPPES registry on July 3, 2007.
Where is Karl Grimmer located?
Karl Grimmer practices at 50 Florida Ave NE Apt 511, Washington, DC 20002. The listed phone number is (219) 902-3878.
What is Karl Grimmer's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Karl Grimmer enrolled in Medicare?
Yes. Karl Grimmer is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Karl Grimmer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karl Grimmer reassigns Medicare benefits to 4 organizations: Surgical Anesthesia Associates, PLLC (Washington, DC), First Colonies Anesthesia Associates, LLC (Columbia, MD), Anesthesia Company, LLC (Annapolis, MD) and Tidalhealth Specialty Care, LLC (Salisbury, MD). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Karl Grimmer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Karl Grimmer affiliated with any hospitals?
According to CMS data, Karl Grimmer is affiliated with Tidalhealth Peninsula Regional, Inc and Atlantic General Hospital.
When was this NPI record last updated?
The NPPES record for Karl Grimmer was last updated on January 18, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Karl Michael Grimmer Jr., MD · NPI 1386842003
Anesthesiology physician in Washington, District of Columbia. Individual provider, active in the CMS NPPES registry since July 3, 2007.
## Identity
- **NPI:** 1386842003 (Entity type: Individual)
- **Enumerated:** July 3, 2007
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** MD041865 (District of Columbia)
- **Sole proprietor:** No
## Practice location
- **Address:** 50 FLORIDA AVE NE APT 511, Washington, DC 20002-6968
- **Phone:** (219) 902-3878
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Surgical Anesthesia Associates, PLLC (NPI 1811930647, Washington, DC); First Colonies Anesthesia Associates, LLC (NPI 1740218767, Columbia, MD); Anesthesia Company, LLC (NPI 1871548156, Annapolis, MD); Tidalhealth Specialty Care, LLC (NPI 1619504735, Salisbury, MD) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Indiana University School Of Medicine, class of 2007
## Record status
- **NPPES last updated:** January 18, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1386842003) · Data from the CMS NPPES public registry.