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RUTH D MACQUARRIE M.D.
NPI 1942334362
Anesthesiology in Greenbrae, CA

Active since March 15, 2007PECOS EnrolledAccepts Medicare Assignment
30 LUCKY DR, GREENBRAE, CA 94904(415) 309-9605(415) 728-9685 Get Directions Write a Review

NPPES record last updated: February 20, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: May 31, 2025, Oct 25, 2022 (2 updates tracked since 2022).

About Ruth D Macquarrie M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

RUTH D MACQUARRIE M.D. (NPI 1942334362) is an individual anesthesiology provider in Greenbrae, California, licensed in California (A80909) and active in the NPI registry since March 2007. She is enrolled in Medicare PECOS and is a graduate of Johns Hopkins University School Of Medicine (1998).

NPPES Registry Identity

NPI1942334362
Entity TypeIndividualFemale
Primary Taxonomy207L00000X
Provider Legal NameRUTH D MACQUARRIECredential: M.D.
Location Address30 LUCKY DRGreenbrae, CA 94904-2407
Mailing AddressPo Box 612Corte Madera, CA 94976-0612 · (415) 309-9605 · Fax (415) 728-9685
Phone(415) 309-9605
Fax(415) 728-9685
Sole ProprietorYes
Medical School CMSJohns Hopkins University School Of MedicineGraduated 1998
Enumeration DateMarch 15, 2007
Last NPPES UpdateFebruary 20, 20262 updates tracked since enumeration
NPPES CertifiedFebruary 20, 2026
✔ NPI 1942334362 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
License✔ Licensed in CA · A80909
Definition
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
Also ListedAnesthesiology · Critical Care MedicineTaxonomy 207LC0200X · License A80909 (CA)
30 LUCKY DR, Greenbrae, CA 94904
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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

Ruth D Macquarrie 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.

PECOS PAC ID143328542
PECOS Enrollment IDI20070608000250
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Ruth Macquarrie reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Pontine Incorporated
32 mi
Anesthesiology
12935 ALCOSTA BLVD UNIT 2037
San Ramon, CA 94583
  • Reassigned Medicare billing, California enrollment
  • 27 clinicians in this Medicare group
NPI 1053757609 (510) 225-9090
Empire Anesthesia Inc
33 mi
Anesthesiology
5201 NORRIS CANYON RD STE 100
San Ramon, CA 94583
  • Reassigned Medicare billing, California enrollment
  • 41 clinicians in this Medicare group
NPI 1174792261 (925) 973-0605

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 Ruth Macquarrie's NPI number?

The NPI number for Ruth Macquarrie is 1942334362. It was assigned to this individual provider in the NPPES registry on March 15, 2007.

Where is Ruth Macquarrie located?

Ruth Macquarrie practices at 30 Lucky Dr, Greenbrae, CA 94904. The listed phone number is (415) 309-9605.

What is Ruth Macquarrie's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is Ruth Macquarrie enrolled in Medicare?

Yes. Ruth Macquarrie 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 Ruth Macquarrie's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ruth Macquarrie reassigns Medicare benefits to 2 organizations: Pontine Incorporated (San Ramon, CA) and Empire Anesthesia Inc (San Ramon, CA). 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 Ruth Macquarrie'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 Ruth Macquarrie was last updated on February 20, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.