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NEPHROLOGY ASSOCIATES OF MONTGOMERY COUNTY
NPI 1619173135
Internal Medicine - Nephrology in Rockville, MD

Active since June 22, 2007CLIA 21D0673337 · Microscopy
6240 MONTROSE RD, ROCKVILLE, MD 20852(301) 231-7111(301) 231-9040 Get Directions Write a Review

NPPES record last updated: April 14, 2015. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Nephrology Associates Of Montgomery County NPPES

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

NEPHROLOGY ASSOCIATES OF MONTGOMERY COUNTY (NPI 1619173135) is a healthcare organization registered as a nephrology in Rockville, Maryland and active in the NPI registry since June 2007. The organization holds a CLIA Microscopy certificate valid through September 1, 2028 and lists Stephen Gaetano Vaccarezza, President, as its authorized official.

NPPES Registry Identity

NPI1619173135
Entity TypeOrganization
Primary Taxonomy207RN0300X
Legal Business NameNEPHROLOGY ASSOCIATES OF MONTGOMERY COUNTY
Location Address6240 MONTROSE RDRockville, MD 20852-4114
Mailing Address6240 Montrose RdRockville, MD 20852-4114 · (301) 231-7111 · Fax (301) 231-9040
Phone(301) 231-7111
Fax(301) 231-9040
Organization SubpartNo
Authorized OfficialStephen Gaetano VaccarezzaPresident · (301) 231-7111
Enumeration DateJune 22, 2007
Last NPPES UpdateApril 14, 2015
✔ NPI 1619173135 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians
Taxonomy Code207RN0300X
Definition
An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.
6240 MONTROSE RD, Rockville, MD 20852
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Other Identifiers 5

Other8535DC · Blue Shield
Medicare PIN154214DC
Medicare UPINA64313
Medicare UPINF18495
Medicaid2256916P000MD

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Nephrology Associates Of Montgomery County is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

2

Medicare enrollment records show 2 clinicians reassign Medicare billing to Nephrology Associates Of Montgomery County, which bills Medicare for the services they deliver. Of these, 2 practice at this address. They are listed nearest first.

Clinicians, nearest first (2)

Stephen Vaccarezza, M.D.
Nephrology
NPI 1861488314
6240 MONTROSE RD
Rockville, MD 20852
(301) 231-7111
✔ PECOS✔ Accepts MedicareSame address
Jeffrey Perlmutter, M.D.
Nephrology
NPI 1588651889
6240 MONTROSE RD
Rockville, MD 20852
(301) 231-7111
✔ PECOS✔ Accepts MedicareSame address

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

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate for Provider-Performed Microscopy Procedures (PPMP) 21D0673337

Nephrology Associates Of Montgomery County · Rockville, MD
Active · expires Sep 1, 2028
CLIA Number21D0673337
Laboratory TypePhysician Office
Certificate Effective DateSeptember 2, 2026
Certificate Expiration DateSeptember 1, 2028
Laboratory DirectorDr. Stephen Vaccarezza
Laboratory Phone(301) 231-7111
Laboratory LocationNephrology Associates Of Montgomery County6240 Montrose Road, Rockville, MD 20852
CLIA data matches this NPI record on: Address Name Phone
This certificate is issued to a laboratory in which a physician, midlevel practitioner or dentist performs no tests other than the microscopy procedures. This certificate permits the laboratory to also perform waived tests.

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 Nephrology Associates Of Montgomery County's NPI number?

The NPI number for Nephrology Associates Of Montgomery County is 1619173135. It was assigned to this organization in the NPPES registry on June 22, 2007.

Where is Nephrology Associates Of Montgomery County located?

Nephrology Associates Of Montgomery County is located at 6240 Montrose Rd, Rockville, MD 20852. The listed phone number is (301) 231-7111.

What is Nephrology Associates Of Montgomery County's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Is Nephrology Associates Of Montgomery County enrolled in Medicare?

Yes. Nephrology Associates Of Montgomery County is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Nephrology Associates Of Montgomery County?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians, all in Nephrology, reassign their Medicare billing to Nephrology Associates Of Montgomery County. A 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 the clinician's services. Of these, 2 practice at this address. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Nephrology Associates Of Montgomery County hold a CLIA laboratory certificate?

Yes. A Certificate for Provider-Performed Microscopy Procedures (PPMP) (number 21D0673337) is associated with this NPI, valid through September 1, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Nephrology Associates Of Montgomery County was last updated on April 14, 2015. 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.