DR. ROBERT SPENCER CHRISTENSEN O.D.
NPI 1639246689
Optometrist in Mill Valley, CA
NPI Status: Active since November 28, 2006
Contact Information
741 E BLITHEDALE AVE
MILL VALLEY, CA
ZIP 94941
Phone: (415) 381-3355
Fax: (415) 381-9579
- Individual
- Male
- Optometrist
About ROBERT CHRISTENSEN
This page provides the complete NPI Profile along with additional information for Robert Christensen, a provider established in Mill Valley, California with a medical specialization in Optometrist. The healthcare provider is registered in the NPI registry with number 1639246689 assigned on November 2006. The practitioner's primary taxonomy code is 152W00000X with license number 6009T (CA). The provider is registered as an individual and his NPI record was last updated 3 years ago.
- NPI
- 1639246689
- Provider Name
- DR. ROBERT SPENCER CHRISTENSEN O.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 741 E BLITHEDALE AVE MILL VALLEY, CA 94941
- Location Phone
- (415) 381-3355
- Location Fax
- (415) 381-9579
- Mailing Address
- 741 E BLITHEDALE AVE MILL VALLEY, CA 94941
- Mailing Phone
- (415) 381-3355
- Mailing Fax
- (415) 381-9579
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 11-28-2006
- Last Update Date
- 03-07-2023
- 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
Optometrist
- Taxonomy Code
- 152W00000X
- Type
- Eye and Vision Services Providers
- License No.
- 6009T
- License State
- CA
- Taxonomy Description
- Doctors of optometry (ODs) are the primary health care professionals for the eye. Optometrists examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. An optometrist has completed pre-professional undergraduate education in a college or university and four years of professional education at a college of optometry, leading to the doctor of optometry (O.D.) degree. Some optometrists complete an optional residency in a specific area of practice. Optometrists are eye health care professionals state-licensed to diagnose and treat diseases and disorders of the eye and visual system.
Areas of Expertise
The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.
Established patient complete exam of visual system
Imaging of retina
New patient complete exam of visual system
Photography of the retina
An established patient complete exam of the visual system involves a thorough check of your eyes and vision. It assesses eye health, checks for diseases, and measures your ability to see clearly at different distances. It's a routine, non-invasive procedure.
This service was performed 80 times for 79 patientsImaging of the retina is a non-invasive procedure that captures detailed images of your eye's interior. This helps detect conditions like macular degeneration or retinal detachment. It's painless and takes only a few minutes.
This service was performed 104 times for 102 patientsA new patient complete exam of the visual system is a thorough evaluation of your eyes and vision. It checks for any potential issues and assesses overall eye health. It includes tests for visual acuity, eye movement, and light response.
This service was performed 19 times for 19 patientsPhotography of the retina, also known as retinal imaging, is a non-invasive procedure that captures images of the back of your eye. This helps doctors identify and monitor conditions like glaucoma, macular degeneration, or diabetic retinopathy. It's painless and quick, often part of a routine eye exam.
This service was performed 106 times for 104 patientsReviews for DR. ROBERT SPENCER CHRISTENSEN O.D.
There are currently no reviews for this provider. Be the first person to share your experience with this provider by filling out our review form. Your insights are appreciated and will help others make informed decisions.
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 1639246689, 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 1639246689, enumerated as an "individual" on November 28, 2006.
The provider is located at 741 E BLITHEDALE AVE MILL VALLEY, CA 94941 and the phone number is (415) 381-3355.
Optometrist with taxonomy code 152W00000X.
