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

MERRIMACK VALLEY INTERNAL MEDICINE
NPI 1801722210
Internal Medicine in Bedford, MA

Active since June 23, 2026CLIA 22D0979424 · Waiver
22 WEBBER AVE, BEDFORD, MA 01730(978) 430-2975 Get Directions Write a Review

NPPES record last updated: August 17, 2026. Verified against the NPPES registry weekly; last sync: September 27, 2026.

Record update history: Aug 17, 2026, Jul 30, 2026 (2 updates tracked since 2026).

About Merrimack Valley Internal Medicine NPPES

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

MERRIMACK VALLEY INTERNAL MEDICINE (NPI 1801722210) is a healthcare organization registered as an internal medicine in Bedford, Massachusetts and active in the NPI registry since June 2026. The organization holds a CLIA Waiver certificate valid through October 22, 2026 and lists Michael G Bertos, Owner, as its authorized official.

NPPES Registry Identity

NPI1801722210
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameMERRIMACK VALLEY INTERNAL MEDICINE
Location Address22 WEBBER AVEBedford, MA 01730-2213
Mailing Address22 Webber AveBedford, MA 01730-2213
Phone(978) 430-2975
Organization SubpartNo
Authorized OfficialMichael G BertosOwner · (978) 459-2152
Enumeration DateJune 23, 2026
Last NPPES UpdateAugust 17, 20262 updates tracked since enumeration
NPPES CertifiedAugust 17, 2026
✔ NPI 1801722210 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
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.
22 WEBBER AVE, Bedford, MA 01730
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Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

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 of Waiver 22D0979424

Merrimack Valley Internal Medicine Associates PC · North Chelmsford, MA
Active · expires Oct 22, 2026
CLIA Number22D0979424
Laboratory TypePhysician Office
Certificate Effective DateOctober 23, 2024
Certificate Expiration DateOctober 22, 2026
Laboratory DirectorLouis Bresnick
Laboratory Phone(978) 459-2152
Laboratory LocationMerrimack Valley Internal Medicine Associates PC20 Research Place Suite 310, North Chelmsford, MA 01863
CLIA data matches this NPI record on: Name Phone
This certificate is issued to a laboratory to perform only waived tests.

Other Providers at the Same Location NPPES

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

MERRIMACK VALLEY INTERNAL MEDICINE LTC
Internal Medicine
22 WEBBER AVE
BEDFORD, MA 01730
Middlesex County (978) 430-2975

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 Merrimack Valley Internal Medicine's NPI number?

The NPI number for Merrimack Valley Internal Medicine is 1801722210. It was assigned to this organization in the NPPES registry on June 23, 2026.

Where is Merrimack Valley Internal Medicine located?

Merrimack Valley Internal Medicine is located at 22 Webber Ave, Bedford, MA 01730. The listed phone number is (978) 430-2975.

What is Merrimack Valley Internal Medicine's specialty?

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

Does Merrimack Valley Internal Medicine hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 22D0979424) is associated with this NPI, valid through October 22, 2026. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Merrimack Valley Internal Medicine was last updated on August 17, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 48 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.