WILLIAM F. LYON MD
NPI 1245423946
Clinic/Center in Laguna Niguel, CA
NPI Status: Active since August 25, 2007
Contact Information
30110 CROWN VALLEY PKWY
LAGUNA NIGUEL, CA
ZIP 92677
Phone: (949) 495-7144
Fax: (949) 495-0270
- Individual
- Male
- Clinic/Center
About WILLIAM LYON
This page provides the complete NPI Profile along with additional information for William Lyon, a provider established in Laguna Niguel, California with a medical specialization in Clinic/center. The healthcare provider is registered in the NPI registry with number 1245423946 assigned on August 2007. The practitioner's primary taxonomy code is 261Q00000X with license number C27618 (CA). The provider is registered as an individual and his NPI record was last updated April 2026.
- NPI
- 1245423946
- Provider Name
- WILLIAM F. LYON MD
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 30110 CROWN VALLEY PKWY LAGUNA NIGUEL, CA 92677
- Location Phone
- (949) 495-7144
- Location Fax
- (949) 495-0270
- Mailing Address
- 30110 CROWN VALLEY PKWY LAGUNA NIGUEL, CA 92677
- Mailing Phone
- (949) 495-7144
- Mailing Fax
- (949) 495-0270
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 08-25-2007
- Last Update Date
- 04-26-2026
- 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
Clinic/Center
- Taxonomy Code
- 261Q00000X
- Type
- Ambulatory Health Care Facilities
- License No.
- C27618
- License State
- CA
- Taxonomy Description
- A facility or distinct part of one used for the diagnosis and treatment of outpatients. Clinic/Center is irregularly defined, sometimes being limited to organizations serving specialized treatment requirements or distinct patient/client groups (e.g., radiology, poor, and public health).
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 | 261QP2300X | Ambulatory Health Care Facilities | Clinic/Center | C276180 (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.
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 |
|---|---|---|---|
| 00C276180 | OTHER (01) | CA | BLUE SHIELD |
| 00C276180 | MEDICAID (05) | CA |
Reviews for WILLIAM F. LYON MD
There are currently no reviews for this provider. Be the first person to share your experience with this provider by filling out our review form. Your insights are appreciated and will help others make informed decisions.
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 1245423946, we treat the final digit (6) 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 74. The final step is to find the difference between that total and the next multiple of ten (80 - 74 = 6).
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 74 is 80. The difference is the calculated check digit.
Other Providers at the Same Location
The following 6 providers are registered at the same or a nearby location.
LAGUNA NIGUEL, CA 92677
LAGUNA NIGUEL, CA 92677
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1245423946, enumerated as an "individual" on August 25, 2007.
The provider is located at 30110 CROWN VALLEY PKWY LAGUNA NIGUEL, CA 92677 and the phone number is (949) 495-7144.
Clinic/Center with taxonomy code 261Q00000X.
The provider might be accepting Accepts: Blue Cross Blue Shield, Medicare and Medicaid. Please consult your insurance carrier or call the provider to verify.
