DAVID C TONG MD
NPI 1386665883
Psychiatry & Neurology - Neurology in San Francisco, CA

NPI Status: Active since July 21, 2006

Contact Information

1100 VAN NESS AVE FL 6
SAN FRANCISCO, CA
ZIP 94109
Phone: (415) 600-5760
Fax: (415) 369-1208

NPI Profile Information
Primary Taxonomy
Secondary Taxonomies
Insurance Plans Accepted
NPI Validation
Other Providers Same Location
Frequently Asked Questions

Individual
Male
Psychiatry & Neurology
Neurology

About DAVID TONG

This page provides the complete NPI Profile along with additional information for David Tong, a provider established in San Francisco, California with a medical specialization in Psychiatry & Neurology, focusing in neurology . The healthcare provider is registered in the NPI registry with number 1386665883 assigned on July 2006. The practitioner's primary taxonomy code is 2084N0400X with license number A48639 (CA). The provider is registered as an individual and his NPI record was last updated 7 years ago.

NPI: 1386665883
Provider Name: DAVID C TONG MD
Gender: Male
Entity Type: Individual
Location Address: 1100 VAN NESS AVE FL 6 SAN FRANCISCO, CA 94109
Location Phone: (415) 600-5760
Location Fax: (415) 369-1208
Mailing Address: 325 DISTEL CIR LOS ALTOS, CA 94022
Mailing Phone: (415) 600-5760
Mailing Fax: (415) 369-1208
Is Sole Proprietor?: No
Enumeration Date: 07-21-2006
Last Update Date: 10-21-2019
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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: Psychiatry & Neurology Neurology
Taxonomy Code: 2084N0400X
Type: Allopathic & Osteopathic Physicians
License No.: A48639
License State: CA
Taxonomy Description: A Neurologist specializes in the diagnosis and treatment of diseases or impaired function of the brain, spinal cord, peripheral nerves, muscles, autonomic nervous system, and blood vessels that relate to these structures.

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)
1	2084V0102X	Allopathic & Osteopathic Physicians	Psychiatry & Neurology Vascular Neurology	A48639 (CA)

Insurance Plans Accepted

According to publicly available information the provider might be accepting the following health plans from these health insurance companies:

Medicare

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

Medicaid

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

Railroad Medicare

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

*Please verify directly with this provider to make sure your insurance plan is currently accepted.

Additional Identifiers

The NPI Enumerator encourages providers to submit additional identifiers with their NPI application although the submission of this information is optional. The additional identifier(s) section includes other numbers or codes currently or formerly used as an identifier for the provider by other public healthcare entities. The identifiers may include UPIN, NSC, OSCAR, DEA, Medicaid State or PIN identification numbers.

Identifier	Type / Code	Identifier State	Identifier Issuer
00A486390	MEDICAID (05)	CA
A48639	OTHER (01)	CA	STATE MEDICAL LICENSE
P00302952	OTHER (01)	CA	RAILROAD MEDICARE

NPI 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 1386665883, we treat the final digit (3) 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 67. The final step is to find the difference between that total and the next multiple of ten (70 - 67 = 3).

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

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 16 → 1 + 6

Pos 4

Unchanged

Pos 5

Doubled → 12 → 1 + 2

Pos 6

Unchanged

Pos 7

Doubled → 10 → 1 + 0

Pos 8

Unchanged

Pos 9

Doubled → 16 → 1 + 6

Check

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 8 → 16 → 7 6 → 12 → 3 5 → 10 → 1 8 → 16 → 7

Step 2: Add all digits plus the NPI constant

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

2 + 3 + 1 + 6 + 6 + 1 + 2 + 6 + 1 + 0 + 8 + 1 + 6 + 24 = 67

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

The next multiple of ten after 67 is 70. The difference is the calculated check digit.

70 - 67 = 3

This NPI is valid

The calculated check digit is 3, which matches the last digit of 1386665883.