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DR. WILLIAM ADDISON WARREN M.D.
NPI 1669478285
Internal Medicine in Laurel, MD

Active since June 28, 2005PECOS Enrolled
8871 GORMAN ROAD, STE 300, LAUREL, MD 20723(301) 498-3150(301) 490-2411 Get Directions Write a Review

NPPES record last updated: June 6, 2016. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. William Addison Warren M.d. NPPES

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

DR. WILLIAM ADDISON WARREN M.D. (NPI 1669478285) is an individual internal medicine provider in Laurel, Maryland, licensed in Maryland (D13916) and active in the NPI registry since June 2005. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1669478285
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. WILLIAM ADDISON WARRENCredential: M.D.
Location Address8871 GORMAN ROAD, STE 300Laurel, MD 20723
Mailing Address8871 Gorman Road, Ste 300Laurel, MD 20723 · (301) 498-3150 · Fax (301) 490-2411
Phone(301) 498-3150
Fax(301) 490-2411
Sole ProprietorNo
Enumeration DateJune 28, 2005
Last NPPES UpdateJune 6, 2016
✔ NPI 1669478285 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MD · D13916
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedInternal Medicine · Pulmonary DiseaseTaxonomy 207RP1001X · License D13916 (MD)
8871 GORMAN ROAD, Laurel, MD 20723
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Other Identifiers 5

Other36778001MD · Blue Shield Of Md
Medicare ID-Type Unspecified942020000MD
Other80160003DC · Blue Shield National Area
Medicare UPIND09329MD
Medicaid411701800MD

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. William Addison Warren M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Warren reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Lifebridge Community Physicians, Inc.
6.6 mi
Endocrinology, Diabetes & Metabolism
5450 KNOLL NORTH DR STE 100
Columbia, MD 21045
  • Reassigned Medicare billing, Maryland enrollment
  • 317 clinicians in this Medicare group
NPI 1477102309 (410) 368-1370

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 20723 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
$139.05 typical visit price
range $60.73 – $183.44
Typical copayment $34.76 (range $15.18 – $45.86)
Most-billed visit code 99204
Established Patient
$106.59 typical visit price
range $19.60 – $149.17
Typical copayment $26.64 (range $4.90 – $37.29)
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.

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 Warren's NPI number?

The NPI number for William Warren is 1669478285. It was assigned to this individual provider in the NPPES registry on June 28, 2005.

Where is William Warren located?

William Warren practices at 8871 Gorman Road Ste 300, Laurel, MD 20723. The listed phone number is (301) 498-3150.

What is William Warren's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is William Warren enrolled in Medicare?

Yes. William Warren is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for William Warren's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Warren reassigns Medicare benefits to Lifebridge Community Physicians, Inc. (Columbia, MD). 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 Warren'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 Warren was last updated on June 6, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.