1. Home
  2. Directory
  3. Massachusetts
  4. Holliston
  5. Internal Medicine
  6. NPI Profile
Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MOHAMMAD M SIDDIQUI MD
NPI 1235190315
Internal Medicine in Holliston, MA

Active since March 29, 2006
479 WASHINGTON ST, HOLLISTON, MA 01746(508) 429-2377(508) 429-2607 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Mohammad M Siddiqui Md NPPES

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

MOHAMMAD M SIDDIQUI MD (NPI 1235190315) is an individual internal medicine provider in Holliston, Massachusetts, licensed in Massachusetts (71839) and active in the NPI registry since March 2006.

NPPES Registry Identity

NPI1235190315
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameMOHAMMAD M SIDDIQUICredential: MD
Location Address479 WASHINGTON STHolliston, MA 01746
Mailing Address479 Washington StHolliston, MA 01746 · (508) 429-2377 · Fax (508) 429-2607
Phone(508) 429-2377
Fax(508) 429-2607
Sole ProprietorNo
Enumeration DateMarch 29, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1235190315 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MA · 71839
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.
479 WASHINGTON ST, Holliston, MA 01746
Open in Google Maps ↗

Other Identifiers 1

Medicaid2059657MA

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.

CASEY MCLAUGHLIN NP
Nurse Practitioner (Family)
479 WASHINGTON ST
HOLLISTON, MA 01746
Middlesex County (508) 429-2377
FOR A NEW YOU PC
Dentist
479 WASHINGTON ST
HOLLISTON, MA 01746
Middlesex County (508) 429-7125
BARBARA A PREUSSNER DMD, PC
Clinic/Center (Dental)
479 WASHINGTON ST, SUITE 2
HOLLISTON, MA 01746
Middlesex County (508) 429-7125
DOUGLAS R GRONDA MD
Internal Medicine
479 WASHINGTON ST
HOLLISTON, MA 01746
Middlesex County (508) 429-2377
MENG GAO NP
Nurse Practitioner (Family)
479 WASHINGTON ST
HOLLISTON, MA 01746
Middlesex County (508) 429-2377

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 Mohammad Siddiqui's NPI number?

The NPI number for Mohammad Siddiqui is 1235190315. It was assigned to this individual provider in the NPPES registry on March 29, 2006.

Where is Mohammad Siddiqui located?

Mohammad Siddiqui practices at 479 Washington St, Holliston, MA 01746. The listed phone number is (508) 429-2377.

What is Mohammad Siddiqui's specialty?

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

When was this NPI record last updated?

The NPPES record for Mohammad Siddiqui was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 38 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.