MARIKO ELIZABETH BLUMENFELD FNP
NPI 1750820965
Nurse Practitioner - Family in San Leandro, CA

Q: What is Mariko Blumenfeld's NPI number?

The NPI number for Mariko Blumenfeld is 1750820965. It was assigned to this individual provider in the NPPES registry on February 21, 2017. The provider is also known as Mariko Elizabeth Lightner Np.

Q: What is Mariko Blumenfeld's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

Q: When was this NPI record last updated?

The NPPES record for Mariko Blumenfeld was last updated on April 6, 2022. 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.

Active since February 21, 2017PECOS Enrolled

13690 E 14TH ST STE 200, SAN LEANDRO, CA 94578(510) 297-0550(510) 297-0558 Get Directions Write a Review

NPPES record last updated: April 6, 2022. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Apr 6, 2022, Feb 21, 2017 (2 updates tracked since 2017).

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About Mariko Elizabeth Blumenfeld Fnp NPPES

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

MARIKO ELIZABETH BLUMENFELD FNP (NPI 1750820965) is an individual family provider in San Leandro, California, licensed in California (95006095) and active in the NPI registry since February 2017. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1750820965

Entity TypeIndividualFemale

Primary Taxonomy363LF0000X

Provider Legal NameMARIKO ELIZABETH BLUMENFELDCredential: FNP

Location Address13690 E 14TH ST STE 200San Leandro, CA 94578-2584

Mailing Address4626 Willow RdPleasanton, CA 94588-8517 · (866) 623-7600

Phone(510) 297-0550

Fax(510) 297-0558

Sole ProprietorNo

Enumeration DateFebruary 21, 2017

Last NPPES UpdateApril 6, 20222 updates tracked since enumeration

NPPES CertifiedApril 6, 2022

✔ NPI 1750820965 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyNurse Practitioner · FamilyPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363LF0000X

License✔ Licensed in CA · 95006095

Also ListedRegistered NurseTaxonomy 163W00000X · License 95053145 (CA)

13690 E 14TH ST STE 200, San Leandro, CA 94578

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Other Names 1

Former Name (1)Mariko Elizabeth Lightner Np

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mariko Elizabeth Blumenfeld Fnp 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 Reassignments

Medicare enrollment records show Mariko Blumenfeld reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Planned Parenthood Shasta Diablo, Inc

9.3 mi

Community Health

200 PORTER DRIVE
San Ramon, CA 94583

Reassigned Medicare billing, California enrollment
61 clinicians in this Medicare group

NPI 1295893550 (925) 838-2108

Tri-Valley Orthopedic And Sports Medical Group Inc

11 mi

Orthopaedic Surgery

5601 NORRIS CANYON RD, SUITE 130
San Ramon, CA 94583

Reassigned Medicare billing, California enrollment
26 clinicians in this Medicare group

NPI 1801883731 (925) 275-1133

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 94578 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

$104.51 typical visit price

range $69.00 – $202.35

Typical copayment $26.12 (range $17.25 – $50.58)

Most-billed visit code 99203

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 4

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

EAST BAY HAND MEDICAL CENTER, INC

Specialist

13690 E 14TH ST STE 200
SAN LEANDRO, CA 94578

Alameda County (510) 297-0550

ANDREW GOODRUM PA-C

Physician Assistant

13690 E 14TH ST STE 200
SAN LEANDRO, CA 94578

Alameda County (510) 297-0550

DR. JESSE DASHE M.D.

Orthopaedic Surgery (Hand Surgery)

13690 E 14TH ST STE 200
SAN LEANDRO, CA 94578

Alameda County (510) 297-0550

ORRIN FRANKO MD

Orthopaedic Surgery (Hand Surgery)

13690 E 14TH ST STE 200
SAN LEANDRO, CA 94578

Alameda County (510) 297-0550

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 Mariko Blumenfeld's NPI number?

The NPI number for Mariko Blumenfeld is 1750820965. It was assigned to this individual provider in the NPPES registry on February 21, 2017. The provider is also known as Mariko Elizabeth Lightner Np.

Where is Mariko Blumenfeld located?

Mariko Blumenfeld practices at 13690 E 14th St Ste 200, San Leandro, CA 94578. The listed phone number is (510) 297-0550.

What is Mariko Blumenfeld's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

Is Mariko Blumenfeld enrolled in Medicare?

Yes. Mariko Blumenfeld is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Mariko Blumenfeld's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mariko Blumenfeld reassigns Medicare benefits to 2 organizations: Planned Parenthood Shasta Diablo, Inc (San Ramon, CA) and Tri-Valley Orthopedic And Sports Medical Group Inc (San Ramon, CA). Each 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 Mariko Blumenfeld'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 Mariko Blumenfeld was last updated on April 6, 2022. 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.