DR. CRAIG JANN LEONG M.D.
NPI 1639103344
Ophthalmology - Retina Specialist in Walnut Creek, CA
NPI Status: Active since July 10, 2006
Contact Information
365 LENNON LN STE 250
WALNUT CREEK, CA
ZIP 94598
Phone: (925) 943-6800
Fax: (925) 943-6880
- Individual
- Male
- Ophthalmology
- Retina Specialist
About CRAIG LEONG
This page provides the complete NPI Profile along with additional information for Craig Leong, a provider established in Walnut Creek, California with a medical specialization in Ophthalmology, focusing in retina specialist . The healthcare provider is registered in the NPI registry with number 1639103344 assigned on July 2006. The practitioner's primary taxonomy code is 207WX0107X with license number G28041 (CA). The provider is registered as an individual and his NPI record was last updated 5 years ago.
- NPI
- 1639103344
- Provider Name
- DR. CRAIG JANN LEONG M.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 365 LENNON LN STE 250 WALNUT CREEK, CA 94598
- Location Phone
- (925) 943-6800
- Location Fax
- (925) 943-6880
- Mailing Address
- 365 LENNON LN STE 250 WALNUT CREEK, CA 94598
- Mailing Phone
- (925) 943-6800
- Mailing Fax
- (925) 943-6880
- Is Sole Proprietor?
- No
- Enumeration Date
- 07-10-2006
- Last Update Date
- 04-29-2021
- Code Navigator
Location Map
Secondary Locations
- 20130 Lake Chabot Rd Ste 303
Castro Valley, CA 94546
(510) 733-1888 - 5980 Stoneridge Dr Ste 117
Pleasanton, CA 94588
(925) 463-8200
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
Ophthalmology Retina Specialist
- Taxonomy Code
- 207WX0107X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- G28041
- License State
- CA
- Taxonomy Description
- An ophthalmologist who specializes in the diagnosis and treatment of vitreoretinal diseases.
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 | 207W00000X | Allopathic & Osteopathic Physicians | Ophthalmology | G28041 (CA) |
Insurance Plans Accepted
According to publicly available information the provider might be accepting the following health plans from these health insurance companies:
Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.
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 |
|---|---|---|---|
| 00G280410 | MEDICAID (05) | CA |
Reviews for DR. CRAIG JANN LEONG M.D.
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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 1639103344, we treat the final digit (4) 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 66. The final step is to find the difference between that total and the next multiple of ten (70 - 66 = 4).
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 66 is 70. The difference is the calculated check digit.
Other Providers at the Same Location
The following 8 providers are registered at the same or a nearby location.
WALNUT CREEK, CA 94598
WALNUT CREEK, CA 94598
WALNUT CREEK, CA 94598
WALNUT CREEK, CA 94598
WALNUT CREEK, CA 94598
WALNUT CREEK, CA 94598
WALNUT CREEK, CA 94598
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1639103344, enumerated as an "individual" on July 10, 2006.
The provider is located at 365 LENNON LN STE 250 WALNUT CREEK, CA 94598 and the phone number is (925) 943-6800.
Ophthalmology with taxonomy code 207WX0107X and a focus in Retina Specialist.
The provider might be accepting Accepts: Medicare and Medicaid. Please consult your insurance carrier or call the provider to verify.
