MARISSA WAT RN, MSN
NPI 1023411642
Nurse Anesthetist, Certified Registered in San Francisco, CA
About Marissa Wat Rn, Msn NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARISSA WAT RN, MSN (NPI 1023411642) is an individual nurse anesthetist, certified registered in San Francisco, California, licensed in California (95000265) and active in the NPI registry since September 2014. She is affiliated with Banner Churchill Community Hospital and is a graduate of Other (2014).
NPPES Registry Identity
Specialties & Licenses 2
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
Marissa Wat Rn, Msn 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
12Medicare enrollment records show Marissa Wat reassigns Medicare billing to 12 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 723 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 clinicians in this Medicare group
Davis, CA 95616
- Reassigned Medicare billing, California enrollment
- 2,570 clinicians in this Medicare group
Carson City, NV 89703
- Reassigned Medicare billing, Nevada enrollment
- 3 clinicians in this Medicare group
Carson City, NV 89701
- Reassigned Medicare billing, Nevada enrollment
Carson City, NV 89703
- Reassigned Medicare billing, Nevada enrollment
- 18 clinicians in this Medicare group
Carson City, NV 89703
- Reassigned Medicare billing, Nevada enrollment
- 90 clinicians in this Medicare group
Reno, NV 89511
- Reassigned Medicare billing, Nevada enrollment
- 50 clinicians in this Medicare group
Reno, NV 89502
- Reassigned Medicare billing, Nevada enrollment
- 59 clinicians in this Medicare group
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 4
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Banner Churchill Community Hospital
Critical Access Hospitals · Fallon, NVPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94143 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
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 Marissa Wat's NPI number?
The NPI number for Marissa Wat is 1023411642. It was assigned to this individual provider in the NPPES registry on September 28, 2014.
Where is Marissa Wat located?
Marissa Wat practices at 505 Parnassus Ave, San Francisco, CA 94143. The listed phone number is (415) 476-9000.
What is Marissa Wat's specialty?
The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.
Is Marissa Wat enrolled in Medicare?
Yes. Marissa Wat 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 Marissa Wat's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marissa Wat reassigns Medicare benefits to 12 organizations: University Anesthesia Medical Group (San Francisco, CA), University Of California San Francisco (San Francisco, CA), Ucsf Medical Group Business Services (San Francisco, CA), Regents Of The Univ Of Ca (Davis, CA), Western Nevada Anesthesia (Carson City, NV) and 7 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 Marissa Wat's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Marissa Wat accept?
Health plans from Ambetter Health and Ambetter from Arizona Complete Health list Marissa Wat 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.
Is Marissa Wat affiliated with any hospitals?
According to CMS data, Marissa Wat is affiliated with Banner Churchill Community Hospital.
When was this NPI record last updated?
The NPPES record for Marissa Wat was last updated on November 5, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.
# Marissa Wat, RN, MSN · NPI 1023411642
Nurse Anesthetist, Certified Registered physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since September 28, 2014.
## Identity
- **NPI:** 1023411642 (Entity type: Individual)
- **Enumerated:** September 28, 2014
- **Primary specialty:** Nurse Anesthetist, Certified Registered · taxonomy 367500000X
- **State license:** 95000265 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 505 PARNASSUS AVE, San Francisco, CA 94143-2204
- **Phone:** (415) 476-9000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Bills Medicare through:** 12 organizations under Medicare reassignment (form CMS-855R): University Anesthesia Medical Group (NPI 1528137296, San Francisco, CA); University Of California San Francisco (NPI 1346329380, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA); Regents Of The Univ Of Ca (NPI 1053304071, Davis, CA); Western Nevada Anesthesia (NPI 1396462248, Carson City, NV); and 7 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2014
## Record status
- **NPPES last updated:** November 5, 2015
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Source: [NPI Profile](https://npiprofile.com/npi/1023411642) · Data from the CMS NPPES public registry.