WILLIAM R CRAIN MD
NPI 1669523338
Dermatology - Procedural Dermatology in Oakland, CA
NPI Status: Active since January 16, 2007
Contact Information
3300 WEBSTER ST
#509
OAKLAND, CA
ZIP 94609
Phone: (510) 452-4900
Fax: (510) 452-2152
- Individual
- Male
- Dermatology
- Procedural Dermatology
About WILLIAM CRAIN
This page provides the complete NPI Profile along with additional information for William Crain, a provider established in Oakland, California with a medical specialization in Dermatology, focusing in procedural dermatology . The healthcare provider is registered in the NPI registry with number 1669523338 assigned on January 2007. The practitioner's primary taxonomy code is 207NS0135X with license number C031924 (CA). The provider is registered as an individual and his NPI record was last updated one year ago.
- NPI
- 1669523338
- Provider Name
- WILLIAM R CRAIN MD
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 3300 WEBSTER ST #509 OAKLAND, CA 94609
- Location Phone
- (510) 452-4900
- Location Fax
- (510) 452-2152
- Mailing Address
- 3300 WEBSTER ST #509 OAKLAND, CA 94609
- Mailing Phone
- (510) 452-4900
- Mailing Fax
- (510) 452-2152
- Is Sole Proprietor?
- No
- Enumeration Date
- 01-16-2007
- Last Update Date
- 09-11-2025
- Code Navigator
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
Dermatology Procedural Dermatology
- Taxonomy Code
- 207NS0135X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- C031924
- License State
- CA
- Taxonomy Description
- Procedural Dermatology, a subspecialty of Dermatology, encompassing a wide variety of surgical procedures and methods to remove or modify skin tissue for health or cosmetic benefit. These methods include scalpel surgery, laser surgery, chemical surgery, cryosurgery (liquid nitrogen), electrosurgery, aspiration surgery, liposuction, injection of filler substances, and Mohs micrographic controlled surgery (a special technique for the removal of growths, especially skin cancers).
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 | 207N00000X | Allopathic & Osteopathic Physicians | Dermatology | C031924 (CA) |
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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 1669523338, we treat the final digit (8) 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 62. The final step is to find the difference between that total and the next multiple of ten (70 - 62 = 8).
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.
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.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
Step 3: Find the amount needed to reach the next multiple of 10
The next multiple of ten after 62 is 70. The difference is the calculated check digit.
Other Providers at the Same Location
The following 20 providers are registered at the same or a nearby location.
OAKLAND, CA 94609
OAKLAND, CA 94609
OAKLAND, CA 94609
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1669523338, enumerated as an "individual" on January 16, 2007.
The provider is located at 3300 WEBSTER ST #509 OAKLAND, CA 94609 and the phone number is (510) 452-4900.
Dermatology with taxonomy code 207NS0135X and a focus in Procedural Dermatology.
