MRS. MARION MACPHAIL PETERSON RN MFT
NPI 1538280854
Registered Nurse in Walnut Creek, CA
NPI Status: Active since April 03, 2007
Contact Information
1756 LACASSIE AVENUE
SUITE 200
WALNUT CREEK, CA
ZIP 94596
Phone: (925) 933-8300
Fax: (510) 843-0276
- Individual
- Female
- Registered Nurse
- Opted-Out Medicare
About MARION PETERSON
This page provides the complete NPI Profile along with additional information for Marion Peterson, a provider established in Walnut Creek, California with a medical specialization in Registered Nurse. The healthcare provider is registered in the NPI registry with number 1538280854 assigned on April 2007. The practitioner's primary taxonomy code is 163W00000X with license number RN 233108 (CA). The provider is registered as an individual and her NPI record was last updated one year ago.
- NPI
- 1538280854
- Provider Name
- MRS. MARION MACPHAIL PETERSON RN MFT
- Other Name
- MRS. MARNIE MACPHAIL PETERSON RN MFT
- Other Name Type
- Other Name (5)
- Gender
- Female
- Entity Type
- Individual
- Location Address
- 1756 LACASSIE AVENUE SUITE 200 WALNUT CREEK, CA 94596
- Location Phone
- (925) 933-8300
- Location Fax
- (510) 843-0276
- Mailing Address
- 1756 LACASSIE AVENUE SUITE 200 WALNUT CREEK, CA 94596
- Mailing Phone
- (925) 933-8300
- Mailing Fax
- (510) 843-0276
- Is Sole Proprietor?
- No
- Enumeration Date
- 04-03-2007
- Last Update Date
- 09-11-2025
- Code Navigator
A registered nurse (RN) like Marion Peterson coordinates and provides patient care and educates patients about various health conditions. Registered nurses give advice and emotional support to patients and their families. The typical duties of a registered nurse include: assessing patient conditions, record medical histories and symptoms, observe patients and record the observations, administer medicines and treatments, consult and collaborate with doctors, operate and monitor medical equipment, teach patients and families how to manage injuries or illnesses, etc.
Registered nurses typically work as part of a team with physicians and other healthcare professionals. In some medical teams registered nurses supervise nursing assistants, licensed practical nurses, and home health aides.
The provider doesn't accept Medicare and has signed an affidavit to be excluded from the Medicare program. If you are a Medicare beneficiary this means a provider can charge whatever they want for services rendered but must follow certain rules to do so. Marion Peterson opted out of Medicare effective on 02-28-2024 until 02-28-2026. Opt out periods last for two years and cannot be terminated unless the provider is opting out for the very first time and the affidavit is terminated no later than 90 days after the opt out effective date. Opt-out affidavits might renew automatically renew every two years. The provider opted out of Medicare and cannot order and refer services to other healthcare providers.
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
Registered Nurse
- Taxonomy Code
- 163W00000X
- Type
- Nursing Service Providers
- License No.
- RN 233108
- License State
- CA
- Taxonomy Description
- (1) A registered nurse is a person qualified by graduation from an accredited nursing school (depending upon schooling, a registered nurse may receive either a diploma from a hospital program, an associate degree in nursing (A.D.N.) or a Bachelor of Science degree in nursing (B.S.N.), who is licensed or certified by the state, and is practicing within the scope of that license or certification. R.N.'s assist patient in recovering and maintaining their physical or mental health. They assist physicians during treatments and examinations and administer medications. (2) A provider who is trained and educated in a formal nursing education program at an accredited school of nursing, passes a national certification examination, and is licensed by the state to practice nursing. The individual provides nursing services to patients or clients in areas such as health promotion, disease prevention, acute and chronic care and restoration and maintenance of health across the life span.
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 | 106H00000X | Behavioral Health & Social Service Providers | Marriage & Family Therapist | MFC 32921 (CA) |
Medicare Participation & PECOS Enrollment Status
What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.
Opted-Out of Medicare? Yes
Opt-Out Effective Date: 02-28-2024
Opt-Out End Date: 02-28-2026
Eligible to Order and Refer? No
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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 1538280854, we treat the final digit (4) 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 66. The final step is to find the difference between that total and the next multiple of ten (70 - 66 = 4).
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 66 is 70. The difference is the calculated check digit.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1538280854, enumerated as an "individual" on April 03, 2007.
The provider is located at 1756 LACASSIE AVENUE SUITE 200 WALNUT CREEK, CA 94596 and the phone number is (925) 933-8300.
Registered Nurse with taxonomy code 163W00000X.
