Natalie Ruth Marks Case, MD
Psychiatry Physician · Stanford, CA
Natalie Ruth Marks Case, MD is a psychiatry physician with a practice address in Stanford, California, and NPI 1093343600, issued on Mar 30, 2020. Check the license (California A193837, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Natalie Ruth Marks Case
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- A193837 CA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Pasteur Dr, Stanford, CA 94305
- Phone
- (650) 723-4000
- Enumerated
- Mar 30, 2020
- Record last updated
- Dec 19, 2025
- Medicare enrollment
- Enrolled (PECOS I20250709003928); accepts Medicare assignment
- Medical or professional school
- Stanford University School Of Medicine, 2020
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 300 Pasteur Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Natalie Ruth Marks Case in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A193837Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average psychiatry physician in 2024
48 Medicare Part D claims for 14 beneficiaries, against an average of 1,000 among the 35,054 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.
One hospital affiliation
- Stanford Health CareStanford, CA · Acute Care Hospitals5 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Natalie Ruth Marks Case among 8,673 psychiatry physician records in California
Natalie Ruth Marks Case, MD is one of 8,673 psychiatry physician records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 87% of them.
- NPI issued2020 · 87% of these records are older, 9% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 38% of these records are
- Graduated2020 · median 2005 among the 3,295 with a school on file
- Record last updated2025 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
116 psychiatry physician records list a practice address in Stanford
They are 116 of the 5,606 NPPES records with a practice address in Stanford, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Stanford → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Bibi Das, MDStanford, CA 943051528012374
- Sidney Edsall, MDPalo Alto, CA 943051588626469
- Douglas Levinson, M.D.Stanford, CA 943051104830207
- Alan Louie, M.D.Stanford, CA 943051881616340
- Elizabeth Mahler, MDStanford, CA 943051033216999
- Douglas Noordsy, MDStanford, CA 943051336236330
- Terry Osback, MDStanford, CA 943051356446827
- Jennifer Pien-Wong, MDStanford, CA 943051699702456
Common questions
What is Natalie Ruth Marks Case, MD's NPI number?
Natalie Ruth Marks Case, MD's National Provider Identifier (NPI) is 1093343600, issued on Mar 30, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Natalie Ruth Marks Case, MD located?
The NPPES record lists a practice address at 300 Pasteur Dr, Stanford, CA, 94305. Phone: (650) 723-4000. Providers update this record themselves, so call before visiting.
How can I verify Natalie Ruth Marks Case, MD's license?
NPPES lists California license number A193837, 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 Natalie Ruth Marks Case, MD prescribe under Medicare Part D?
In 2024, Natalie Ruth Marks Case, MD had 48 Medicare Part D claims for 14 beneficiaries; the average among psychiatry physician prescribers was 1,000. 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.