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MARION L. GUYER MD
NPI 1942388749
Internal Medicine in Greebrae, CA

Active since November 01, 2006PECOS Enrolled
1300 S. ELISEO, SUITE 203, GREEBRAE, CA 94902(415) 461-5552(415) 464-8964 Get Directions Write a Review

NPPES record last updated: October 5, 2023. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Oct 5, 2023, Apr 26, 2021, Apr 8, 2021 and 2 more (5 updates tracked since 2018).

About Marion L. Guyer Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARION L. GUYER MD (NPI 1942388749) is an individual internal medicine provider in Greebrae, California, licensed in California (A66859) and active in the NPI registry since November 2006. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1942388749
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameMARION L. GUYERCredential: MD
Location Address1300 S. ELISEO, SUITE 203Greebrae, CA 94902-1408
Mailing Address1300 S. Eliseo, Suite 203Greebrae, CA 94902-1408 · (415) 461-5552 · Fax (415) 464-8964
Phone(415) 461-5552
Fax(415) 464-8964
Sole ProprietorNo
Enumeration DateNovember 1, 2006
Last NPPES UpdateOctober 5, 20235 updates tracked since enumeration
NPPES CertifiedOctober 3, 2023
✔ NPI 1942388749 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A66859
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Other Identifiers 2

Medicaid1942388749CT
OtherA66859CA · State Medical License

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Marion L. Guyer Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 7

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
169 services89 patients
New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205
This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.
39 services39 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
30 services30 patients
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000
An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.
19 services18 patients
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
19 services16 patients
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439
An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.
16 services16 patients

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Marion Guyer's NPI number?

The NPI number for Marion Guyer is 1942388749. It was assigned to this individual provider in the NPPES registry on November 1, 2006.

Where is Marion Guyer located?

Marion Guyer practices at 1300 S. Eliseo Suite 203, Greebrae, CA 94902. The listed phone number is (415) 461-5552.

What is Marion Guyer's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Marion Guyer enrolled in Medicare?

Yes. Marion Guyer is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Marion Guyer was last updated on October 5, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.