Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

SANAH SIDDIQUI MD
NPI 1891371209
Internal Medicine - Infectious Disease in Bay Shore, NY

Active since March 24, 2021
40 E MAIN ST, BAY SHORE, NY 11706(631) 526-9728 Get Directions Write a Review

NPPES record last updated: July 17, 2026. Verified against the NPPES registry weekly; last sync: July 19, 2026.

Record update history: Jul 17, 2026, Mar 31, 2021, Mar 24, 2021 (3 updates tracked since 2021).

  • Individual
  • Female
  • Internal Medicine
  • Infectious Disease

About SANAH SIDDIQUI

This page provides the complete NPI Profile along with additional information for Sanah Siddiqui, an internist established in Bay Shore, New York with a medical specialization in Internal Medicine, focusing in infectious disease . The healthcare provider is registered in the NPI registry with number 1891371209 assigned on March 2021. The practitioner's primary taxonomy code is 207RI0200X with license number 339784 (NY). The provider is registered as an individual and her NPI record was last updated July 2026.

NPI
1891371209
Provider Name
SANAH SIDDIQUI MD
Gender
Female
Entity Type
Individual
Location Address
40 E MAIN ST BAY SHORE, NY 11706
Location Phone
(631) 526-9728
Mailing Address
40 E MAIN ST BAY SHORE, NY 11706
Mailing Phone
(631) 526-9728
Is Sole Proprietor?
No
Enumeration Date
03-24-2021
Last Update Date
07-17-2026
Code Navigator

An internist like Sanah Siddiqui is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.

Location Map

Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Internal Medicine Infectious Disease

Taxonomy Code
207RI0200X
Type
Allopathic & Osteopathic Physicians
License No.
339784
License State
NY
Taxonomy Description
An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.

Secondary Taxonomies

The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.

No. Taxonomy Code Type Classification /
Specialization
License No. (State)
1390200000XStudent, Health Care

Student in an Organized Health Care Education/Training Program

 

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NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1891371209, we treat the final digit (9) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 61. The final step is to find the difference between that total and the next multiple of ten (70 - 61 = 9).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1
1
Doubled → 2
Pos 2
8
Unchanged
Pos 3
9
Doubled → 18 → 1 + 8
Pos 4
1
Unchanged
Pos 5
3
Doubled → 6
Pos 6
7
Unchanged
Pos 7
1
Doubled → 2
Pos 8
2
Unchanged
Pos 9
0
Doubled → 0
Check
9
Target digit
Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 9 → 18 → 9 3 → 6 1 → 2 0 → 0

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 8 + 1 + 8 + 1 + 6 + 7 + 2 + 2 + 0 + 24 = 61

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 61 is 70. The difference is the calculated check digit.

70 - 61 = 9
This NPI is valid
The calculated check digit is 9, which matches the last digit of 1891371209.

Other Providers at the Same Location


The following 15 providers are registered at the same or a nearby location.

Podiatrist
40 E MAIN ST
BAY SHORE, NY 11706
Internal Medicine (Clinical Cardiac Electrophysiology)
40 E MAIN ST
BAY SHORE, NY 11706
Internal Medicine (Infectious Disease)
40 E MAIN ST
BAY SHORE, NY 11706
Internal Medicine
40 E MAIN ST
BAY SHORE, NY 11706
Internal Medicine (Infectious Disease)
40 E MAIN ST
BAY SHORE, NY 11706
Internal Medicine (Infectious Disease)
40 E MAIN ST
BAY SHORE, NY 11706
Internal Medicine (Infectious Disease)
40 E MAIN ST
BAY SHORE, NY 11706
Physician Assistant (Medical)
40 E MAIN ST
BAY SHORE, NY 11706
Internal Medicine (Infectious Disease)
40 E MAIN ST
BAY SHORE, NY 11706
Internal Medicine (Infectious Disease)
40 E MAIN ST
BAY SHORE, NY 11706
Internal Medicine (Infectious Disease)
40 E MAIN ST
BAY SHORE, NY 11706
Internal Medicine (Infectious Disease)
40 E MAIN ST
BAY SHORE, NY 11706
Internal Medicine (Infectious Disease)
40 E MAIN ST
BAY SHORE, NY 11706
Nurse Practitioner (Adult Health)
40 E MAIN ST
BAY SHORE, NY 11706
Podiatrist
40 E MAIN ST
BAY SHORE, NY 11706

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1891371209, enumerated as an "individual" on March 24, 2021.

The provider is located at 40 E MAIN ST BAY SHORE, NY 11706 and the phone number is (631) 526-9728.

Internal Medicine with taxonomy code 207RI0200X and a focus in Infectious Disease.