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DR. WARREN ORRIN FERRIS MD
NPI 1487744280
Internal Medicine in Silver Spring, MD

Active since October 13, 2006PECOS EnrolledAccepts Medicare Assignment
80.17/100
CMS Quality Rating
3305 NORTH LEISURE WORLD BOULEVARD, SILVER SPRING, MD 20906(301) 598-1554(301) 558-1509 Get Directions Write a Review

NPPES record last updated: June 19, 2013. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Dr. Warren Orrin Ferris Md NPPES

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

DR. WARREN ORRIN FERRIS MD (NPI 1487744280) is an individual internal medicine provider in Silver Spring, Maryland, licensed in Maryland (D31918) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS, is affiliated with Medstar Montgomery Medical Center, and is a graduate of University Of Missouri, Columbia School Of Medicine (1976).

NPPES Registry Identity

NPI1487744280
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. WARREN ORRIN FERRISCredential: MD
Location Address3305 NORTH LEISURE WORLD BOULEVARDSilver Spring, MD 20906
Mailing Address3305 North Leisure World BoulevardSilver Spring, MD 20906 · (301) 598-1554 · Fax (301) 598-1569
Phone(301) 598-1554
Fax(301) 558-1509
Sole ProprietorNo
Medical School CMSUniversity Of Missouri, Columbia School Of MedicineGraduated 1976
Enumeration DateOctober 13, 2006
Last NPPES UpdateJune 19, 2013
✔ NPI 1487744280 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 · D31918
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 · RheumatologyTaxonomy 207RR0500X · License D31918 (MD)
3305 NORTH LEISURE WORLD BOULEVARD, Silver Spring, MD 20906
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Other Names 1

Other Name (5)Dr. Warren Orrin Ferris M.d.

Other Identifiers 3

Medicare ID-Type Unspecified127365L41
Medicare UPINB93542
Medicaid607100700MD

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. Warren Orrin Ferris 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.

PECOS PAC ID3577758515
PECOS Enrollment IDI20101116000566
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 Warren Ferris reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Medstar Medical Group II LLC
13 mi
Anesthesiology
110 IRVING ST NW
Washington, DC 20010
  • Reassigned Medicare billing, District of Columbia enrollment
  • 3,530 clinicians in this Medicare group
NPI 1023836137 (703) 558-1403

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 4

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.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
595 services235 patients
New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205
This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.
89 services89 patients
Aspiration and/or injection of fluid from large joint 20610
This procedure involves using a needle to remove (aspiration) or introduce (injection) fluid into a large joint like the knee or hip. It can help diagnose conditions, relieve discomfort, or deliver medication directly to the joint.
31 services21 patients
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
31 services31 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Medstar Montgomery Medical Center

Acute Care Hospitals · Olney, MD
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number210018
Location18101 Prince Philip DriveOlney, MD 20832 · Montgomery County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 20906 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.

Medicare 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.

80.17/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality76.69
Promoting Interoperability100
Improvement Activities40
Cost53.49

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 Warren Ferris's NPI number?

The NPI number for Warren Ferris is 1487744280. It was assigned to this individual provider in the NPPES registry on October 13, 2006. The provider is also known as Dr. Warren Orrin Ferris M.D..

Where is Warren Ferris located?

Warren Ferris practices at 3305 North Leisure World Boulevard, Silver Spring, MD 20906. The listed phone number is (301) 598-1554.

What is Warren Ferris's specialty?

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

Is Warren Ferris enrolled in Medicare?

Yes. Warren Ferris 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 Warren Ferris's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Warren Ferris 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 Warren Ferris's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Warren Ferris affiliated with any hospitals?

According to CMS data, Warren Ferris is affiliated with Medstar Montgomery Medical Center.

When was this NPI record last updated?

The NPPES record for Warren Ferris was last updated on June 19, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.