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DR. MARY L GARREN M.D.
NPI 1801806567
Internal Medicine - Gastroenterology in Monterey, CA

Active since August 08, 2006PECOS Enrolled
23 UPPER RAGSDALE DR, SUITE 200, MONTEREY, CA 93940(831) 375-3577(831) 375-1478 Get Directions Write a Review

NPPES record last updated: July 9, 2007. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Dr. Mary L Garren M.d. NPPES

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

DR. MARY L GARREN M.D. (NPI 1801806567) is an individual gastroenterology provider in Monterey, California, licensed in California (G81025) and active in the NPI registry since August 2006. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1801806567
Entity TypeIndividualFemale
Primary Taxonomy207RG0100X
Provider Legal NameDR. MARY L GARRENCredential: M.D.
Location Address23 UPPER RAGSDALE DR, SUITE 200Monterey, CA 93940-5771
Mailing Address23 Upper Ragsdale Dr, Suite 200Monterey, CA 93940-5771 · (831) 375-3577 · Fax (831) 375-1478
Phone(831) 375-3577
Fax(831) 375-1478
Sole ProprietorNo
Enumeration DateAugust 8, 2006
Last NPPES UpdateJuly 9, 2007
✔ NPI 1801806567 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
License✔ Licensed in CA · G81025
Definition
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
23 UPPER RAGSDALE DR, Monterey, CA 93940
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Other Identifiers 1

Medicare UPINC49209CA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Mary L Garren M.d. 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.

Medicare Billing Reassignment

Medicare enrollment records show Mary Garren reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Emergency And Acute Care Medical Corporation
371 mi
Emergency Medicine
7901 FROST ST
San Diego, CA 92123
  • Reassigned Medicare billing, California enrollment
  • 1,437 clinicians in this Medicare group
NPI 1437103942 (858) 939-3400

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 93940 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$139.84 typical visit price
range $61.69 – $184.30
Typical copayment $34.96 (range $15.42 – $46.07)
Most-billed visit code 99204
Established Patient
$108.04 typical visit price
range $20.34 – $151.02
Typical copayment $27.01 (range $5.08 – $37.75)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 15

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. RICHARD WALTER HELL M.D.
Internal Medicine (Gastroenterology)
23 UPPER RAGSDALE DR, SUITE 200
MONTEREY, CA 93940
Monterey County (831) 375-3577
MONTEREY BAY GI CONSULTANTS MEDICAL GROUP INC.
Internal Medicine (Gastroenterology)
23 UPPER RAGSDALE DR, SUITE 200
MONTEREY, CA 93940
Monterey County (831) 375-3577
MS. CYNTHIA ELLEN RUSSELL-MCCLAIN N.P., P.A.-C
Nurse Practitioner
23 UPPER RAGSDALE DR, SUITE 200
MONTEREY, CA 93940
Monterey County (831) 375-3577
DR. MICHAEL R SMITH M.D.
Internal Medicine (Gastroenterology)
23 UPPER RAGSDALE DR, SUITE 200
MONTEREY, CA 93940
Monterey County (831) 375-3577
DR. TOBY J KATZ M.D.
Internal Medicine (Gastroenterology)
23 UPPER RAGSDALE DR, SUITE 200
MONTEREY, CA 93940
Monterey County (831) 375-3577
DR. JAMES A DI SARIO M.D.
Internal Medicine (Gastroenterology)
23 UPPER RAGSDALE DR, SUITE 200
MONTEREY, CA 93940
Monterey County (831) 375-3577
MICHAEL SANG LE M.D.
Internal Medicine (Gastroenterology)
23 UPPER RAGSDALE DR
MONTEREY, CA 93940
Monterey County (831) 375-3577
SILVIA F GIACHETTI NP
Nurse Practitioner (Family)
23 UPPER RAGSDALE DR
MONTEREY, CA 93940
Monterey County (831) 375-3577

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 Mary Garren's NPI number?

The NPI number for Mary Garren is 1801806567. It was assigned to this individual provider in the NPPES registry on August 8, 2006.

Where is Mary Garren located?

Mary Garren practices at 23 Upper Ragsdale Dr Suite 200, Monterey, CA 93940. The listed phone number is (831) 375-3577.

What is Mary Garren's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Mary Garren enrolled in Medicare?

Yes. Mary Garren is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Mary Garren's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mary Garren reassigns Medicare benefits to Emergency And Acute Care Medical Corporation (San Diego, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mary Garren's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Mary Garren was last updated on July 9, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.