TOSHIAKI TAKAHASHI M.D.
NPI 1609566850
Internal Medicine - Hematology & Oncology in Honolulu, HI
NPI Status: Active since May 10, 2023
Contact Information
1301 PUNCHBOWL ST
HONOLULU, HI
ZIP 96813
Phone: (808) 691-1000
NPPES record last updated: June 2, 2026. Verified against the NPPES registry weekly; last sync: July 12, 2026.
- Individual
- Male
- Internal Medicine
- Hematology & Oncology
About TOSHIAKI TAKAHASHI
This page provides the complete NPI Profile along with additional information for Toshiaki Takahashi, an internist established in Honolulu, Hawaii with a medical specialization in Internal Medicine, focusing in hematology & oncology . The healthcare provider is registered in the NPI registry with number 1609566850 assigned on May 2023. The practitioner's primary taxonomy code is 207RH0003X with license number 47508 (OK). The provider is registered as an individual and his NPI record was last updated June 2026.
- NPI
- 1609566850
- Provider Name
- TOSHIAKI TAKAHASHI M.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 1301 PUNCHBOWL ST HONOLULU, HI 96813
- Location Phone
- (808) 691-1000
- Mailing Address
- 800 NE 10TH ST OKLAHOMA CITY, OK 73104
- Mailing Phone
- (405) 271-4022
- Is Sole Proprietor?
- No
- Enumeration Date
- 05-10-2023
- Last Update Date
- 06-02-2026
- Code Navigator
An internist like Toshiaki Takahashi is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.
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
Internal Medicine Hematology & Oncology
- Taxonomy Code
- 207RH0003X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- 47508
- License State
- OK
- Taxonomy Description
- An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.
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 | 390200000X | Student, Health Care | Student in an Organized Health Care Education/Training Program |
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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 1609566850, we treat the final digit (0) 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 60. The final step is to find the difference between that total and the next multiple of ten (60 - 60 = 0).
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 60 is 60. The difference is the calculated check digit.
Other Providers at the Same Location
The following 20 providers are registered at the same or a nearby location.
HONOLULU, HI 96813
HONOLULU, HI 96813
HONOLULU, HI 96813
HONOLULU, HI 96813
HONOLULU, HI 96813
HONOLULU, HI 96813
HONOLULU, HI 96813
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1609566850, enumerated as an "individual" on May 10, 2023.
The provider is located at 1301 PUNCHBOWL ST HONOLULU, HI 96813 and the phone number is (808) 691-1000.
Internal Medicine with taxonomy code 207RH0003X and a focus in Hematology & Oncology.
