Cassandra Lai Mellinger
Obstetrics & Gynecology Physician · San Ramon, CA
Cassandra Lai Mellinger is an obstetrics & gynecology physician with a practice address in San Ramon, California, and NPI 1811647803, issued on Mar 24, 2022. Check the license (California 20A25423, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Cassandra Lai Mellinger
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- 20A25423 CA
Self-reported in NPPES; status is on the state search - Practice location
- 12677 Alcosta Blvd Ste 220, San Ramon, CA 94583
- Phone
- (925) 254-9840
- Enumerated
- Mar 24, 2022
- Record last updated
- Aug 6, 2026
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 12677 Alcosta Blvd Ste 220
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ravneet SandhuFamily Nurse Practitioner1598482085
Verify Cassandra Lai Mellinger in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A25423Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
22 Medicare Part D claims for 14 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $121.98
1 payment: food and beverage; the largest payer was Organon Llc. The 21,429 providers of this specialty with any payment received $1,030.61 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Cassandra Lai Mellinger among 5,088 obstetrics & gynecology physician records in California
Cassandra Lai Mellinger is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 98% of them.
- NPI issued2022 · 98% of these records are older, under 1% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 53% of these records are
- Record last updated2026 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in San Ramon → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Ravi Agarwal, MDSan Ramon, CA 945831710331236
- Curtis Appel, MDSan Ramon, CA 945831831279314
- Emil Eyvazzadeh, MDSan Ramon, CA 945831881702462
- Renee Hilliard, M.D.San Ramon, CA 945831245265065
- Leroy Leabman, MDSan Ramon, CA 945831598041360
- Mark Lollar, MDSan Ramon, CA 945831124119623
- Helen Matthews, M.D.San Ramon, CA 945831013015627
- Spenser Perloff, M.D.San Ramon, CA 945831861855272
Common questions
What is Cassandra Lai Mellinger's NPI number?
Cassandra Lai Mellinger's National Provider Identifier (NPI) is 1811647803, issued on Mar 24, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Cassandra Lai Mellinger located?
The NPPES record lists a practice address at 12677 Alcosta Blvd Ste 220, San Ramon, CA, 94583. Phone: (925) 254-9840. Providers update this record themselves, so call before visiting.
How can I verify Cassandra Lai Mellinger's license?
NPPES lists California license number 20A25423, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Cassandra Lai Mellinger prescribe under Medicare Part D?
In 2024, Cassandra Lai Mellinger had 22 Medicare Part D claims for 14 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.