MARY ELIZABETH HARTNETT MD
NPI 1871507020
Ophthalmology - Retina Specialist in Stanford, CA
About Mary Elizabeth Hartnett Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARY ELIZABETH HARTNETT MD (NPI 1871507020) is an individual retina specialist in Stanford, California, licensed in California (G185717) and active in the NPI registry since July 2006. She is enrolled in Medicare PECOS, maintains a secondary practice location in Salt Lake City, and is a graduate of Albany Medical College Of Union University (1983).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Other Identifiers 1
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
Mary Elizabeth Hartnett Md 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
5Medicare enrollment records show Mary Elizabeth Hartnett reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Stanford, CA 94305
- Reassigned Medicare billing, California enrollment
- 4,258 clinicians in this Medicare group
Palo Alto, CA 94304
- Reassigned Medicare billing, California enrollment
- 3,617 clinicians in this Medicare group
Riverton, UT 84065
- Reassigned Medicare billing, Utah enrollment
- 751 clinicians in this Medicare group
Salt Lake City, UT 84132
- Reassigned Medicare billing, Utah enrollment
- 2,620 clinicians in this Medicare group
Salt Lake City, UT 84107
- Reassigned Medicare billing, Utah enrollment
- Medicare enrollment name: University Of Utah
- 144 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
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 94305 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.
STANFORD, CA 94305
STANFORD, CA 94305
STANFORD, CA 94305
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 Mary Elizabeth Hartnett's NPI number?
The NPI number for Mary Elizabeth Hartnett is 1871507020. It was assigned to this individual provider in the NPPES registry on July 27, 2006.
Where is Mary Elizabeth Hartnett located?
Mary Elizabeth Hartnett practices at 300 Pasteur Dr, Stanford, CA 94305. The listed phone number is (650) 723-4000.
What is Mary Elizabeth Hartnett's specialty?
The primary specialty registered for this NPI is Ophthalmology, specializing in Retina Specialist, with taxonomy code 207WX0107X.
Is Mary Elizabeth Hartnett enrolled in Medicare?
Yes. Mary Elizabeth Hartnett 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 Mary Elizabeth Hartnett's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Elizabeth Hartnett reassigns Medicare benefits to 5 organizations: Stanford Health Care (Stanford, CA), Lpch Medical Group Div Of Lucile (Palo Alto, CA), University Of Utah Pediatric Services (Riverton, UT), University Of Utah Adult Services (Salt Lake City, UT) and University Of Utah Healthcare (Salt Lake City, UT). 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 Mary Elizabeth Hartnett's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Mary Elizabeth Hartnett was last updated on April 3, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Mary Elizabeth Hartnett, MD · NPI 1871507020
Retina Specialist physician in Stanford, California. Individual provider, active in the CMS NPPES registry since July 27, 2006.
## Identity
- **NPI:** 1871507020 (Entity type: Individual)
- **Enumerated:** July 27, 2006
- **Primary specialty:** Ophthalmology - Retina Specialist · taxonomy 207WX0107X
- **State license:** G185717 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 PASTEUR DR, Stanford, CA 94305-2200
- **Phone:** (650) 723-4000
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): Stanford Health Care (NPI 1437292927, Stanford, CA); Lpch Medical Group Div Of Lucile (NPI 1417907940, Palo Alto, CA); University Of Utah Pediatric Services (NPI 1043671985, Riverton, UT); University Of Utah Adult Services (NPI 1578967345, Salt Lake City, UT); University Of Utah Healthcare (NPI 1235546573, Salt Lake City, UT) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Albany Medical College Of Union University, class of 1983
## Record status
- **NPPES last updated:** April 3, 2024
- **Other identifiers:** Medicaid 891338F (NC)
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Source: [NPI Profile](https://npiprofile.com/npi/1871507020) · Data from the CMS NPPES public registry.