MARIAM HASAN M.D
NPI 1851604847
Internal Medicine in Oakland, CA
About Mariam Hasan M.d NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARIAM HASAN M.D (NPI 1851604847) is an individual internal medicine provider in Oakland, California, licensed in California (A124405) and active in the NPI registry since July 2010. She is enrolled in Medicare PECOS and is a graduate of Other (2005).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
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
Mariam Hasan M.d 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.
Medicare Billing Reassignments
10Medicare enrollment records show Mariam Hasan reassigns Medicare billing to 10 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Oakland, CA 94602
- Reassigned Medicare billing, California enrollment
- 900 clinicians in this Medicare group
San Francisco, CA 94109
- Reassigned Medicare billing, California enrollment
- 131 clinicians in this Medicare group
San Pablo, CA 94806
- Reassigned Medicare billing, California enrollment
- 530 clinicians in this Medicare group
South San Francisco, CA 94080
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1831268580 (California)
- 597 clinicians in this Medicare group
San Jose, CA 95138
- Reassigned Medicare billing, California enrollment
- 4 clinicians in this Medicare group
Westlake Village, CA 91361
- Reassigned Medicare billing, California enrollment
- 77 clinicians in this Medicare group
Lawndale, CA 90260
- Reassigned Medicare billing, California enrollment
- 3 clinicians in this Medicare group
Los Angeles, CA 90059
- Reassigned Medicare billing, California enrollment
- 198 clinicians in this Medicare group
West Covina, CA 91790
- Reassigned Medicare billing, California enrollment
- 24 clinicians in this Medicare group
Tustin, CA 92782
- Reassigned Medicare billing, California enrollment
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94602 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 11
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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.
OAKLAND, CA 94602
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 Mariam Hasan's NPI number?
The NPI number for Mariam Hasan is 1851604847. It was assigned to this individual provider in the NPPES registry on July 19, 2010.
Where is Mariam Hasan located?
Mariam Hasan practices at 1411 E 31st St, Oakland, CA 94602. The listed phone number is (408) 332-1755.
What is Mariam Hasan's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Mariam Hasan enrolled in Medicare?
Yes. Mariam Hasan 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 organizations bill Medicare for Mariam Hasan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mariam Hasan reassigns Medicare benefits to 10 organizations: Alameda Health System (Oakland, CA), California Emergency Physicians Medical Group A Professional Corp (San Francisco, CA), Contra Costa County (San Pablo, CA), County Of San Mateo (South San Francisco, CA), Boundless Care, Inc. (San Jose, CA) and 5 more organizations, listed in the Medicare section above. 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 Mariam Hasan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mariam Hasan accept?
Health plans from Anthem Blue Cross and Blue Shield list Mariam Hasan as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Mariam Hasan was last updated on April 14, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Mariam Hasan, M.D · NPI 1851604847
Internal Medicine physician in Oakland, California. Individual provider, active in the CMS NPPES registry since July 19, 2010.
## Identity
- **NPI:** 1851604847 (Entity type: Individual)
- **Enumerated:** July 19, 2010
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A124405 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1411 E 31ST ST, Oakland, CA 94602-1018
- **Phone:** (408) 332-1755
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 10 organizations under Medicare reassignment (form CMS-855R): Alameda Health System (NPI 1740332931, Oakland, CA); California Emergency Physicians Medical Group A Professional Corp (NPI 1316364474, San Francisco, CA); Contra Costa County (NPI 1417036484, San Pablo, CA); County Of San Mateo (NPI 1609812148, South San Francisco, CA); Boundless Care, Inc. (NPI 1588704449, San Jose, CA); and 5 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2005
## Record status
- **NPPES last updated:** April 14, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1851604847) · Data from the CMS NPPES public registry.