What is Marissa St. Joan's NPI number?

Marissa St. Joan's National Provider Identifier (NPI) is 1073981452, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Marissa St. Joan's specialty?

Marissa St. Joan is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).

Where is Marissa St. Joan located?

Marissa St. Joan's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.

What is Marissa St. Joan's phone number?

The practice phone number listed in the NPPES registry for Marissa St. Joan is (650) 723-4000.

Does Marissa St. Joan accept Medicare?

Marissa St. Joan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.

Is Marissa St. Joan's NPI active?

Yes — Marissa St. Joan's NPI (1073981452) is active in the NPPES registry as of the last update on 2025-11-06.

IndividualActiveAccepts Medicare

Marissa St. Joan, PA

NPI 1073981452 · Physician Assistant · Stanford, CA

Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Marissa St. Joan, PA is a Physician Assistant provider in Stanford, CA (NPI 1073981452).

Provider details

NPI number: 1073981452
Entity type: Individual
Primary specialty: Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
Credential: PA
Sex: Female
Sole proprietor: No

Specialties & taxonomies

Physician AssistantPrimary363A00000XLicense 57837 (CA)
Physician Assistants & Advanced Practice Nursing Providers
Mental Health Counselor101YM0800X
Behavioral Health & Social Service Providers

Profile Score

Established profile(51/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure28% of score
10 yrs in NPPES registry
Profile completeness28% of score
83% of core fields populated
Practice footprint17% of score
1 documented practice location
Medicare service volume (vs. specialty peers)28% of score
101 Medicare services, 2024 (ranked within specialty)

Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

What this provider does (Medicare)

Based on Medicare fee-for-service claims, 2024; not all care is captured.

Service (HCPCS)	Medicare services	Typical Medicare-allowed (2024)
Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233	76	$119
Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232	14	$79
Advance Care Planning, First 30 Minutes99497	11	$77

Typical Medicare-allowed amounts for these services range $77–$119 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.

Practice location

300 Pasteur Dr

Stanford, CA 94305-2200

Phone: (650) 723-4000

Approximate (ZIP-level) locationGet directions

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Mailing address