DR. H R CHRISTOPHER O'BRIEN PHARM.D, BCPP, APH
NPI 1598885162
Pharmacist - Psychiatric in Los Angeles, CA
NPI Status: Active since March 29, 2007
Contact Information
1127 WILSHIRE BLVD STE 1415
LOS ANGELES, CA
ZIP 90017
Phone: (213) 924-8889
Fax: (213) 924-8889
- Individual
- Male
- Pharmacist
- Psychiatric
About H R O'BRIEN
This page provides the complete NPI Profile along with additional information for H R O'brien, a provider established in Los Angeles, California with a medical specialization in Pharmacist, focusing in psychiatric . The healthcare provider is registered in the NPI registry with number 1598885162 assigned on March 2007. The practitioner's primary taxonomy code is 1835P1300X with license number 10158 (CA). The provider is registered as an individual and his NPI record was last updated December 2025.
- NPI
- 1598885162
- Provider Name
- DR. H R CHRISTOPHER O'BRIEN PHARM.D, BCPP, APH
- Other Name
- DR. CHRIS O'BRIEN PHARM.D. BCPP, APH
- Other Name Type
- Professional Name (2)
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 1127 WILSHIRE BLVD STE 1415 LOS ANGELES, CA 90017
- Location Phone
- (213) 924-8889
- Location Fax
- (213) 924-8889
- Mailing Address
- 10413 OLD RIVER SCHOOL RD DOWNEY, CA 90241
- Mailing Phone
- (213) 924-8889
- Mailing Fax
- (213) 924-8889
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 03-29-2007
- Last Update Date
- 12-12-2025
- Code Navigator
A pharmacist like H R O'brien fills prescription medications, verifying instructions from physicians and offers expertise in the safe use of prescriptions. Pharmacists instruct patients on how to take a prescribed medicine and educate patients about potential side effects. Pharmacists might also conduct health and wellness screenings, provide immunizations, oversee the medications given to patients, and provide advice on healthy lifestyles.
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
Pharmacist Psychiatric
- Taxonomy Code
- 1835P1300X
- Type
- Pharmacy Service Providers
- License No.
- 10158
- License State
- CA
- Taxonomy Description
- A licensed pharmacist who has demonstrated specialized knowledge and skill in optimizing care of patients with psychiatric illness by assessing and monitoring patients, recognizing drug-induced problems, and recommending appropriate treatment plans.
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 | 183500000X | Pharmacy Service Providers | Pharmacist | 49570 (CA) |
| 2 | 208U00000X | Allopathic & Osteopathic Physicians | Clinical Pharmacology | 49570 (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 1598885162, we treat the final digit (2) 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 68. The final step is to find the difference between that total and the next multiple of ten (70 - 68 = 2).
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 68 is 70. The difference is the calculated check digit.
Other Providers at the Same Location
The following 4 providers are registered at the same or a nearby location.
LOS ANGELES, CA 90017
LOS ANGELES, CA 90017
LOS ANGELES, CA 90017
LOS ANGELES, CA 90017
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1598885162, enumerated as an "individual" on March 29, 2007.
The provider is located at 1127 WILSHIRE BLVD STE 1415 LOS ANGELES, CA 90017 and the phone number is (213) 924-8889.
Pharmacist with taxonomy code 1835P1300X and a focus in Psychiatric.
