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GRETCHEN K. MELLO MD
NPI 1841378635
Internal Medicine in Oakland, CA

Active since November 01, 2006PECOS EnrolledAccepts Medicare Assignment
275 W MACARTHUR BLVD, OAKLAND, CA 94611(510) 752-1000 Get Directions Write a Review

NPPES record last updated: December 20, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Gretchen K. Mello Md NPPES

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

GRETCHEN K. MELLO MD (NPI 1841378635) is an individual internal medicine provider in Oakland, California, licensed in California (A86072) and active in the NPI registry since November 2006. She is enrolled in Medicare PECOS and is a graduate of Stanford University School Of Medicine (2002).

NPPES Registry Identity

NPI1841378635
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameGRETCHEN K. MELLOCredential: MD
Location Address275 W MACARTHUR BLVDOakland, CA 94611-5641
Mailing Address275 W Macarthur BlvdOakland, CA 94611-5641 · (510) 752-1000
Phone(510) 752-1000
Sole ProprietorNo
Medical School CMSStanford University School Of MedicineGraduated 2002
Enumeration DateNovember 1, 2006
Last NPPES UpdateDecember 20, 2021
✔ NPI 1841378635 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 · A86072
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.
275 W MACARTHUR BLVD, Oakland, CA 94611
Open in Google Maps ↗

Other Identifiers 1

Medicaid00A860720CA

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Gretchen K. Mello Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID446289243
PECOS Enrollment IDI20050811000758
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 Gretchen Mello reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Permanente Medical Group Inc
10 mi
Internal Medicine
901 NEVIN
Richmond, CA 94801
  • Reassigned Medicare billing, California enrollment
  • 20,078 clinicians in this Medicare group
NPI 1235226531 (510) 307-1555

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 94611 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
$153.83 typical visit price
range $69.00 – $202.35
Typical copayment $38.45 (range $17.25 – $50.58)
Most-billed visit code 99204
Established Patient
$119.48 typical visit price
range $23.44 – $166.46
Typical copayment $29.87 (range $5.86 – $41.61)
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 20

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

DR. ANNA C. MORGAN MD
Specialist
275 W MACARTHUR BLVD
OAKLAND, CA 94611
Alameda County (510) 752-1000
DR. TRANG H. LA MD
Radiology (Radiation Oncology)
275 W MACARTHUR BLVD
OAKLAND, CA 94611
Alameda County (510) 752-1000
DR. AMIN MATIN M.D., M.P.H.
Radiology (Diagnostic Radiology)
275 W MACARTHUR BLVD
OAKLAND, CA 94611
Alameda County (925) 295-5758
SUCHETA KORWAR MD
Student in an Organized Health Care Education/Training Program
275 W MACARTHUR BLVD
OAKLAND, CA 94611
Alameda County (510) 752-1000
MR. MATTHEW GABRIELSON D.P.T.
Physical Therapist (Orthopedic)
275 W MACARTHUR BLVD
OAKLAND, CA 94611
Alameda County (510) 752-6221
MALORIE HACKER MD
Student in an Organized Health Care Education/Training Program
275 W MACARTHUR BLVD
OAKLAND, CA 94611
Alameda County (510) 752-1000
RENEE L. PERRY DO
Obstetrics & Gynecology
275 W MACARTHUR BLVD
OAKLAND, CA 94611
Alameda County (510) 752-1000
HERPRIT KAUR MAHAL MD
Hospitalist
275 W MACARTHUR BLVD
OAKLAND, CA 94611
Alameda County (510) 752-1000

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 Gretchen Mello's NPI number?

The NPI number for Gretchen Mello is 1841378635. It was assigned to this individual provider in the NPPES registry on November 1, 2006.

Where is Gretchen Mello located?

Gretchen Mello practices at 275 W Macarthur Blvd, Oakland, CA 94611. The listed phone number is (510) 752-1000.

What is Gretchen Mello's specialty?

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

Is Gretchen Mello enrolled in Medicare?

Yes. Gretchen Mello is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Gretchen Mello's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gretchen Mello reassigns Medicare benefits to Permanente Medical Group Inc (Richmond, 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 Gretchen Mello'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 Gretchen Mello was last updated on December 20, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.