Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. REBECCA FELSEN MD
NPI 1477863884
Internal Medicine in Rockville, MD

Q: What is Rebecca Felsen's NPI number?

The NPI number for Rebecca Felsen is 1477863884. It was assigned to this individual provider in the NPPES registry on October 19, 2010.

Q: What is Rebecca Felsen's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Rebecca Felsen was last updated on September 3, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 days 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.

Active since October 19, 2010PECOS EnrolledAccepts Medicare Assignment

9601 BLACKWELL RD STE 210, ROCKVILLE, MD 20850(301) 200-1687(866) 701-4905 Get Directions Write a Review

NPPES record last updated: September 3, 2026. Verified against the NPPES registry weekly; last sync: September 20, 2026.

Record update history: Sep 3, 2026, Oct 2, 2024 (2 updates tracked since 2024).

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About Dr. Rebecca Felsen Md NPPES

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

DR. REBECCA FELSEN MD (NPI 1477863884) is an individual internal medicine provider in Rockville, Maryland, licensed in Maryland (D0073497) and active in the NPI registry since October 2010. She is enrolled in Medicare PECOS and is a graduate of Georgetown University School Of Medicine (2008).

NPPES Registry Identity

NPI1477863884

Entity TypeIndividualFemale

Primary Taxonomy207R00000X

Provider Legal NameDR. REBECCA FELSENCredential: MD

Location Address9601 BLACKWELL RD STE 210Rockville, MD 20850-6491

Mailing Address9601 Blackwell Rd Ste 210Rockville, MD 20850-6491 · (301) 200-1687 · Fax (866) 701-4905

Phone(301) 200-1687

Fax(866) 701-4905

Sole ProprietorNo

Medical School CMSGeorgetown University School Of MedicineGraduated 2008

Enumeration DateOctober 19, 2010

Last NPPES UpdateSeptember 3, 20262 updates tracked since enumeration

NPPES CertifiedSeptember 3, 2026

✔ NPI 1477863884 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in MD · D0073497

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.

9601 BLACKWELL RD STE 210, Rockville, MD 20850

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Rebecca Felsen 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 ID6608018783

PECOS Enrollment IDI20130820000783

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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 20850 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.

Referred Medical Equipment & Supplies CMS DME claims 6

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253

DME-Other DME · category DE017N

12 suppliers54 claims133 services$6.10 avg. paid by Medicare

Lancets, per box of 100 A4259

DME-Medical/Surgical Supplies · category DA000N

9 suppliers29 claims51 services$1.06 avg. paid by Medicare

Albuterol, inhalation solution, fda-approved final product, non-compounded, administered through dme, unit dose, 1 mg J7613

DME-Drugs Administered Through DME · category DG006N

5 suppliers17 claims3,672 services$0.03 avg. paid by Medicare

Ipratropium bromide, inhalation solution, fda-approved final product, non-compounded, administered through dme, unit dose form, per milligram J7644

DME-Drugs Administered Through DME · category DG006N

1 supplier11 claims660 services$0.15 avg. paid by Medicare

Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service K0553

DME-Other DME · category DE017N

3 suppliers17 claims17 services$215.43 avg. paid by Medicare

Pharmacy dispensing fee for inhalation drug(s); per 30 days Q0513

DME-Other DME · category DE000N

5 suppliers19 claims19 services$19.19 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 5

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DOCTORS FIRST PROFESSIONAL CORPORATION

Internal Medicine