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WILLIAM WILL KUENSTNER
NPI 1225615123
Internal Medicine - Endocrinology, Diabetes & Metabolism in Washington, DC

Active since March 26, 2021PECOS EnrolledAccepts Medicare Assignment
3800 RESERVOIR RD NW, WASHINGTON, DC 20007(202) 687-2818(877) 485-1479 Get Directions Write a Review

NPPES record last updated: June 10, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About William Will Kuenstner NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM WILL KUENSTNER (NPI 1225615123) is an individual endocrinology, diabetes & metabolism provider in Washington, District Of Columbia, licensed in District Of Columbia (MD500003333) and active in the NPI registry since March 2021. He is enrolled in Medicare PECOS and is a graduate of West Virginia University School Of Medicine (2021).

NPPES Registry Identity

NPI1225615123
Entity TypeIndividualMale
Primary Taxonomy207RE0101X
Provider Legal NameWILLIAM WILL KUENSTNER
Location Address3800 RESERVOIR RD NWWashington, DC 20007-2113
Mailing Address3800 Reservoir Rd Nw, Pasquerilla Healthcare CenterWashington, DC 20007-2113 · (202) 687-2818 · Fax (877) 485-1479
Phone(202) 687-2818
Fax(877) 485-1479
Sole ProprietorNo
Medical School CMSWest Virginia University School Of MedicineGraduated 2021
Enumeration DateMarch 26, 2021
Last NPPES UpdateJune 10, 2026
NPPES CertifiedJune 10, 2026
✔ NPI 1225615123 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
License✔ Licensed in DC · MD500003333
Definition
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.
3800 RESERVOIR RD NW, Washington, DC 20007
Open in Google Maps ↗

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

William Will Kuenstner 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.

PECOS PAC ID6800360918
PECOS Enrollment IDI20260630002014, I20260630002501
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show William Kuenstner reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Medstar Medical Group II LLC
Same address
Critical Care Medicine
3800 RESERVOIR RD NW
Washington, DC 20007
  • Reassigned Medicare billing, District of Columbia and Maryland enrollments
  • Also billed through NPI 1376887844 (Maryland)
  • 3,530 clinicians in this Medicare group
NPI 1205562816 (703) 558-1403

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 20007 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$147.85 typical visit price
range $65.18 – $194.86
Typical copayment $36.96 (range $16.29 – $48.71)
Most-billed visit code 99204
Established Patient
$113.72 typical visit price
range $21.40 – $158.88
Typical copayment $28.43 (range $5.35 – $39.72)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

DR. KAUSTUBH SUBHASH YADWADKAR M.D.
Radiology (Diagnostic Radiology)
3800 RESERVOIR RD NW, CG201
WASHINGTON, DC 20007
District of Columbia (304) 206-7595
FRED MO MD
Orthopaedic Surgery (Orthopaedic Surgery of the Spine)
3800 RESERVOIR RD NW
WASHINGTON, DC 20007
District of Columbia (202) 444-8766
SEBLE YIRGA
Nurse Practitioner (Family)
3800 RESERVOIR RD NW
WASHINGTON, DC 20007
District of Columbia (202) 444-7265
ARLETTE THOMPSON-PILE
Physical Therapy Assistant
3800 RESERVOIR RD NW, PHYSICAL MEDICINE AND REHBAILITATION DEPARTMENT
WASHINGTON, DC 20007
District of Columbia (202) 444-3689
JENNA ELIZABETH HOROWITZ
Physician Assistant (Surgical)
3800 RESERVOIR RD NW, NEUROSURGERY DEPARTMENT
WASHINGTON, DC 20007
District of Columbia (202) 444-2000
HALEY SWANSON FOSTER M.D.
Radiology (Vascular & Interventional Radiology)
3800 RESERVOIR RD NW
WASHINGTON, DC 20007
District of Columbia (202) 444-5022
CLAIRE DALBY MD
Student in an Organized Health Care Education/Training Program
3800 RESERVOIR RD NW
WASHINGTON, DC 20007
District of Columbia (202) 444-7106
MS. AMANDA JORDAN SUN PA-C
Physician Assistant
3800 RESERVOIR RD NW
WASHINGTON, DC 20007
District of Columbia (877) 772-6505

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 Kuenstner's NPI number?

The NPI number for William Kuenstner is 1225615123. It was assigned to this individual provider in the NPPES registry on March 26, 2021.

Where is William Kuenstner located?

William Kuenstner practices at 3800 Reservoir Rd NW, Washington, DC 20007. The listed phone number is (202) 687-2818.

What is William Kuenstner's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Is William Kuenstner enrolled in Medicare?

Yes. William Kuenstner 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 organization bills Medicare for William Kuenstner's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Kuenstner reassigns Medicare benefits to Medstar Medical Group II LLC (Washington, DC). The 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 Kuenstner'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 Kuenstner was last updated on June 10, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.