STEPHEN JOHN RONAN MD
NPI 1649239971
Plastic Surgery in Danville, CA
NPI Status: Active since March 23, 2006
Contact Information
3600 BLACKHAWK PLAZA CIR
DANVILLE, CA
ZIP 94506
Phone: (925) 736-5757
Fax: (925) 736-5763
- Individual
- Male
- Plastic Surgery
About STEPHEN RONAN
This page provides the complete NPI Profile along with additional information for Stephen Ronan, a provider established in Danville, California with a medical specialization in Plastic Surgery. The healthcare provider is registered in the NPI registry with number 1649239971 assigned on March 2006. The practitioner's primary taxonomy code is 208200000X with license number A72320 (CA). The provider is registered as an individual and his NPI record was last updated December 2025.
- NPI
- 1649239971
- Provider Name
- STEPHEN JOHN RONAN MD
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 3600 BLACKHAWK PLAZA CIR DANVILLE, CA 94506
- Location Phone
- (925) 736-5757
- Location Fax
- (925) 736-5763
- Mailing Address
- 3600 BLACKHAWK PLAZA CIR DANVILLE, CA 94506
- Mailing Phone
- (925) 736-5757
- Mailing Fax
- (925) 736-5763
- Is Sole Proprietor?
- No
- Enumeration Date
- 03-23-2006
- Last Update Date
- 12-23-2025
- 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
Plastic Surgery
- Taxonomy Code
- 208200000X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- A72320
- License State
- CA
- Taxonomy Description
- A plastic surgeon deals with the repair, reconstruction or replacement of physical defects of form or function involving the skin, musculoskeletal system, craniomaxillofacial structures, hand, extremities, breast and trunk and external genitalia or cosmetic enhancement of these areas of the body. Cosmetic surgery is an essential component of plastic surgery. The plastic surgeon uses cosmetic surgical principles to both improve overall appearance and to optimize the outcome of reconstructive procedures. The surgeon uses aesthetic surgical principles not only to improve undesirable qualities of normal structures but in all reconstructive procedures as well.
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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 1649239971, we treat the final digit (1) 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 79. The final step is to find the difference between that total and the next multiple of ten (80 - 79 = 1).
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 79 is 80. The difference is the calculated check digit.
Other Providers at the Same Location
The following 3 providers are registered at the same or a nearby location.
DANVILLE, CA 94506
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1649239971, enumerated as an "individual" on March 23, 2006.
The provider is located at 3600 BLACKHAWK PLAZA CIR DANVILLE, CA 94506 and the phone number is (925) 736-5757.
Plastic Surgery with taxonomy code 208200000X.
