DR. JONATHAN GEORGE ROBERT SAMUEL FISHER M.D.
NPI 1649476359
Otolaryngology - Sleep Medicine in Orinda, CA
NPI Status: Active since June 21, 2007
Contact Information
85 SOUTHWOOD DR
ORINDA, CA
ZIP 94563
Phone: (925) 876-7936
- Individual
- Male
- Otolaryngology
- Sleep Medicine
About JONATHAN FISHER
This page provides the complete NPI Profile along with additional information for Jonathan Fisher, a provider established in Orinda, California with a medical specialization in Otolaryngology, focusing in sleep medicine . The healthcare provider is registered in the NPI registry with number 1649476359 assigned on June 2007. The practitioner's primary taxonomy code is 207YS0012X with license number A90665 (CA). The provider is registered as an individual and his NPI record was last updated one year ago.
- NPI
- 1649476359
- Provider Name
- DR. JONATHAN GEORGE ROBERT SAMUEL FISHER M.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 85 SOUTHWOOD DR ORINDA, CA 94563
- Location Phone
- (925) 876-7936
- Mailing Address
- 85 SOUTHWOOD DR ORINDA, CA 94563
- Mailing Phone
- (925) 876-7936
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 06-21-2007
- Last Update Date
- 09-11-2025
- 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
Otolaryngology Sleep Medicine
- Taxonomy Code
- 207YS0012X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- A90665
- License State
- CA
- Taxonomy Description
- An Otolaryngologist who practices Sleep Medicine is certified in the subspecialty of sleep medicine and specializes in the clinical assessment, physiologic testing, diagnosis, management and prevention of sleep and circadian rhythm disorders. Sleep specialists treat patients of any age and use multidisciplinary approaches. Disorders managed by sleep specialists include, but are not limited to, sleep related breathing disorders, insomnia, hypersomnias, circadian rhythm sleep disorders, parasomnias and sleep related movement disorders.
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 | 207Y00000X | Allopathic & Osteopathic Physicians | Otolaryngology | A90665 (CA) |
| 2 | 207Y00000X | Allopathic & Osteopathic Physicians | Otolaryngology | ME 96746 (FL) |
| 3 | 207YP0228X | Allopathic & Osteopathic Physicians | Otolaryngology | A90665 (CA) |
| 4 | 207YP0228X | Allopathic & Osteopathic Physicians | Otolaryngology | ME 96746 (FL) |
| 5 | 207YS0123X | Allopathic & Osteopathic Physicians | Otolaryngology | A90665 (CA) |
| 6 | 207YS0123X | Allopathic & Osteopathic Physicians | Otolaryngology | ME 96746 (FL) |
| 7 | 207YX0007X | Allopathic & Osteopathic Physicians | Otolaryngology | A90665 (CA) |
| 8 | 207YX0007X | Allopathic & Osteopathic Physicians | Otolaryngology | ME96746 (FL) |
| 9 | 207YX0602X | Allopathic & Osteopathic Physicians | Otolaryngology | A90665 (CA) |
| 10 | 207YX0602X | Allopathic & Osteopathic Physicians | Otolaryngology | ME96746 (FL) |
| 11 | 208200000X | Allopathic & Osteopathic Physicians | Plastic Surgery | A90665 (CA) |
| 12 | 208200000X | Allopathic & Osteopathic Physicians | Plastic Surgery | ME96746 (FL) |
| 13 | 2082S0105X | Allopathic & Osteopathic Physicians | Plastic Surgery | A90665 (CA) |
| 14 | 2082S0105X | Allopathic & Osteopathic Physicians | Plastic Surgery | ME96746 (FL) |
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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 1649476359, we treat the final digit (9) 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 71. The final step is to find the difference between that total and the next multiple of ten (80 - 71 = 9).
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 71 is 80. The difference is the calculated check digit.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1649476359, enumerated as an "individual" on June 21, 2007.
The provider is located at 85 SOUTHWOOD DR ORINDA, CA 94563 and the phone number is (925) 876-7936.
Otolaryngology with taxonomy code 207YS0012X and a focus in Sleep Medicine.
