ROBERT SEAN CASTLE
NPI 1821981945
Counselor - Addiction (Substance Use Disorder) in Fountain Valley, CA
NPI Status: Active since May 29, 2025
Contact Information
18950 MOUNT WALTON CIR
FOUNTAIN VALLEY, CA
ZIP 92708
Phone: (714) 316-9578
- Individual
- Male
- Counselor
- Addiction (Substance Use Disorder)
About ROBERT CASTLE
This page provides the complete NPI Profile along with additional information for Robert Castle, a provider established in Fountain Valley, California with a medical specialization in Counselor, focusing in addiction (substance use disorder) . The healthcare provider is registered in the NPI registry with number 1821981945 assigned on May 2025. The practitioner's primary taxonomy code is 101YA0400X with license number R1547870224 (CA). The provider is registered as an individual and his NPI record was last updated May 2025.
- NPI
- 1821981945
- Provider Name
- ROBERT SEAN CASTLE
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 18950 MOUNT WALTON CIR FOUNTAIN VALLEY, CA 92708
- Location Phone
- (714) 316-9578
- Mailing Address
- 18950 MOUNT WALTON CIR FOUNTAIN VALLEY, CA 92708
- Mailing Phone
- (714) 316-9578
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 05-29-2025
- Last Update Date
- 05-29-2025
- Code Navigator
A Substance Abuse or Addiction Counselor like Robert Castle advices patients who experience alcoholism, drug addiction, eating disorders, mental health issues, or other mental or behavioral problems. Substance Abuse counselors provide treatment and support to help clients recover from addiction or modify problem behaviors. Many counselors incorporate the principles of 12-step programs, such as Alcoholics Anonymous (AA). They educate clients how to cope with stress and life’s issues in ways that help them recover. Counselors also help patients improve their personal relationships and find ways to discuss their addiction or other problems with family and friends.
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
Counselor Addiction (Substance Use Disorder)
- Taxonomy Code
- 101YA0400X
- Type
- Behavioral Health & Social Service Providers
- License No.
- R1547870224
- License State
- CA
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NPI Validation Check Digit Calculation
The following table explains the step by step NPI number validation process using the ISO standard Luhn algorithm.
| Start with the original NPI number, the last digit is the check digit and is not used in the calculation. | |||||||||
| 1 | 8 | 2 | 1 | 9 | 8 | 1 | 9 | 4 | 5 |
| Step 1: Double the value of the alternate digits, beginning with the rightmost digit. | |||||||||
| 2 | 8 | 4 | 1 | 18 | 8 | 2 | 9 | 8 | |
| Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24. | |||||||||
| 2 + 8 + 4 + 1 + 1 + 8 + 8 + 2 + 9 + 8 + 24 = 75 | |||||||||
| Step 3: Subtract the total obtained in step 2 from the next higher number ending in zero, the result is the check digit. | |||||||||
| 80 - 75 = 5 | 5 | ||||||||
The NPI number 1821981945 is valid because the calculated check digit 5 using the Luhn validation algorithm matches the last digit of the original NPI number.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1821981945, enumerated in the NPI registry as an "individual" on May 29, 2025
The provider is located at 18950 Mount Walton Cir Fountain Valley, Ca 92708 and the phone number is (714) 316-9578
The provider's speciality is Counselor with taxonomy code 101YA0400X with a focus in Addiction (Substance Use Disorder)
This NPI record was last updated on May 29, 2025. To officially update your NPI information contact the National Plan and Provider Enumeration System (NPPES) at 1-800-465-3203 (NPI Toll-Free) or by email at [email protected].
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