DR. KAREN ROBERTA MASER M.D.
NPI 1699834986
Obstetrics & Gynecology in Fairfax, VA

Q: What is Karen Maser's NPI number?

The NPI number for Karen Maser is 1699834986. It was assigned to this individual provider in the NPPES registry on December 6, 2006.

Q: What is Karen Maser's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Q: Is Karen Maser enrolled in Medicare?

No. Karen Maser has opted out of Medicare through October 5, 2026. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

Q: When was this NPI record last updated?

The NPPES record for Karen Maser was last updated on September 4, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.

Active since December 06, 2006Opted out of Medicare · through Oct 5, 2026

8505 ARLINGTON BLVD STE 410, FAIRFAX, VA 22031(703) 560-9070(703) 560-9024 Get Directions Write a Review

NPPES record last updated: September 4, 2014. Verified against the NPPES registry weekly; last sync: August 16, 2026.

On this page

About Dr. Karen Roberta Maser M.d. NPPES

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

DR. KAREN ROBERTA MASER M.D. (NPI 1699834986) is an individual obstetrics & gynecology provider in Fairfax, Virginia, licensed in Virginia (0101058017) and active in the NPI registry since December 2006. She has opted out of Medicare through October 5, 2026 and remains eligible to order and refer.

NPPES Registry Identity

NPI1699834986

Entity TypeIndividualFemale

Primary Taxonomy207V00000X

Provider Legal NameDR. KAREN ROBERTA MASERCredential: M.D.

Location Address8505 ARLINGTON BLVD STE 410Fairfax, VA 22031-4636

Mailing Address8505 Arlington Blvd Ste 410Fairfax, VA 22031-4636 · (703) 560-9070 · Fax (703) 560-9024

Phone(703) 560-9070

Fax(703) 560-9024

Sole ProprietorYes

Enumeration DateDecember 6, 2006

Last NPPES UpdateSeptember 4, 2014

✔ NPI 1699834986 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians

Taxonomy Code207V00000X

License✔ Licensed in VA · 0101058017

Definition

An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.

8505 ARLINGTON BLVD STE 410, Fairfax, VA 22031

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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Dr. Karen Roberta Maser M.d. has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from October 5, 2022 through October 5, 2026.

Opt-Out Effective DateOctober 5, 2022

Opt-Out In Effect ThroughOctober 5, 2026Opt-out affidavits renew automatically every two years unless cancelled

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 22031 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

$80.66 typical visit price

range $21.40 – $158.88

Typical copayment $20.16 (range $5.35 – $39.72)

Most-billed visit code 99213

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

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

DR. TRAVIS JAMES DE MIK M.D.

Obstetrics & Gynecology

8505 ARLINGTON BLVD STE 410
FAIRFAX, VA 22031

Fairfax County (703) 560-9070

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 Karen Maser's NPI number?

The NPI number for Karen Maser is 1699834986. It was assigned to this individual provider in the NPPES registry on December 6, 2006.

Where is Karen Maser located?

Karen Maser practices at 8505 Arlington Blvd Ste 410, Fairfax, VA 22031. The listed phone number is (703) 560-9070.

What is Karen Maser's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is Karen Maser enrolled in Medicare?

No. Karen Maser has opted out of Medicare through October 5, 2026. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Karen Maser was last updated on September 4, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.