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CASSANDRA LAI MELLINGER
NPI 1811647803
Obstetrics & Gynecology in San Ramon, CA

Active since March 24, 2022PECOS Enrolled
12677 ALCOSTA BLVD STE 220, SAN RAMON, CA 94583(925) 254-9840 Get Directions Write a Review

NPPES record last updated: August 6, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Cassandra Lai Mellinger NPPES

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

CASSANDRA LAI MELLINGER (NPI 1811647803) is an individual obstetrics & gynecology provider in San Ramon, California, licensed in California (20A25423) and active in the NPI registry since March 2022. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1811647803
Entity TypeIndividualFemale
Primary Taxonomy207V00000X
Provider Legal NameCASSANDRA LAI MELLINGER
Location Address12677 ALCOSTA BLVD STE 220San Ramon, CA 94583-4413
Mailing Address1450 Treat Blvd Ste 300Walnut Creek, CA 94597-2168 · (925) 952-2828
Phone(925) 254-9840
Sole ProprietorNo
Enumeration DateMarch 24, 2022
Last NPPES UpdateAugust 6, 2026
NPPES CertifiedAugust 6, 2026
✔ NPI 1811647803 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
License✔ Licensed in CA · 20A25423
Definition
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.
12677 ALCOSTA BLVD STE 220, San Ramon, CA 94583
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Cassandra Lai Mellinger 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 Cassandra Mellinger reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

John Muir Physician Network
12 mi
General Practice
1450 TREAT BLVD, SUITE 300
Walnut Creek, CA 94597
  • Reassigned Medicare billing, California enrollment
  • 650 clinicians in this Medicare group
NPI 1841407665 (925) 296-9872

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 94583 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
$84.91 typical visit price
range $23.44 – $166.46
Typical copayment $21.22 (range $5.86 – $41.61)
Most-billed visit code 99213
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

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

RAVNEET KAUR SANDHU
Nurse Practitioner (Family)
12677 ALCOSTA BLVD STE 220
SAN RAMON, CA 94583
Contra Costa County (925) 254-9840

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 Cassandra Mellinger's NPI number?

The NPI number for Cassandra Mellinger is 1811647803. It was assigned to this individual provider in the NPPES registry on March 24, 2022.

Where is Cassandra Mellinger located?

Cassandra Mellinger practices at 12677 Alcosta Blvd Ste 220, San Ramon, CA 94583. The listed phone number is (925) 254-9840.

What is Cassandra Mellinger's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is Cassandra Mellinger enrolled in Medicare?

Yes. Cassandra Mellinger is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Cassandra Mellinger's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Cassandra Mellinger reassigns Medicare benefits to John Muir Physician Network (Walnut Creek, 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 Cassandra Mellinger'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 Cassandra Mellinger was last updated on August 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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.