MR. WILLIAM DOOLIN
NPI 1336688803
Nurse Anesthetist, Certified Registered in Washington, DC
About Mr. William Doolin NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MR. WILLIAM DOOLIN (NPI 1336688803) is an individual nurse anesthetist, certified registered in Washington, District Of Columbia, licensed in District Of Columbia (RN1034564) and active in the NPI registry since February 2017. He is a graduate of Other (2016).
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
Mr. William Doolin 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
3Medicare enrollment records show William Doolin reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Washington, DC 20010
- Reassigned Medicare billing, District of Columbia enrollment
- 482 clinicians in this Medicare group
Washington, DC 20010
- Reassigned Medicare billing, District of Columbia enrollment
- 3,530 clinicians in this Medicare group
Washington, DC 20010
- Reassigned Medicare billing, District of Columbia enrollment
- 264 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
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 20010 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WASHINGTON, DC 20010
WASHINGTON, DC 20010
WASHINGTON, DC 20010
WASHINGTON, DC 20010
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 William Doolin's NPI number?
The NPI number for William Doolin is 1336688803. It was assigned to this individual provider in the NPPES registry on February 16, 2017.
Where is William Doolin located?
William Doolin practices at 110 Irving St NW, Washington, DC 20010. The listed phone number is (202) 877-6286.
What is William Doolin's specialty?
The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.
Is William Doolin enrolled in Medicare?
Yes. William Doolin 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 William Doolin's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Doolin reassigns Medicare benefits to 3 organizations: Medstar Medical Group Anesthesiology LLC (Washington, DC), Medstar Medical Group II LLC (Washington, DC) and Washington Hospital Center Corp (Washington, DC). 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 William Doolin's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for William Doolin was last updated on February 16, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 years 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.
# Mr. William Doolin · NPI 1336688803
Nurse Anesthetist, Certified Registered physician in Washington, District of Columbia. Individual provider, active in the CMS NPPES registry since February 16, 2017.
## Identity
- **NPI:** 1336688803 (Entity type: Individual)
- **Enumerated:** February 16, 2017
- **Primary specialty:** Nurse Anesthetist, Certified Registered · taxonomy 367500000X
- **State license:** RN1034564 (District of Columbia)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 110 IRVING ST NW, Washington, DC 20010-3017
- **Phone:** (202) 877-6286
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Medstar Medical Group Anesthesiology LLC (NPI 1558976175, Washington, DC); Medstar Medical Group II LLC (NPI 1023836137, Washington, DC); Washington Hospital Center Corp (NPI 1376627406, Washington, DC) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2016
## Record status
- **NPPES last updated:** February 16, 2017
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Source: [NPI Profile](https://npiprofile.com/npi/1336688803) · Data from the CMS NPPES public registry.