Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

DR. MARGARET GUO MD, PHD
NPI 1174225379
Internal Medicine - Medical Oncology in San Francisco, CA

Q: What is Margaret Guo's NPI number?

The NPI number for Margaret Guo is 1174225379. It was assigned to this individual provider in the NPPES registry on March 20, 2023.

Q: What is Margaret Guo's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.

Q: When was this NPI record last updated?

The NPPES record for Margaret Guo was last updated on July 17, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.

Active since March 20, 2023PECOS Enrolled

505 PARNASSUS AVE # M1480, SAN FRANCISCO, CA 94143(415) 476-1000 Get Directions Write a Review

NPPES record last updated: July 17, 2026. Verified against the NPPES registry weekly; last sync: July 19, 2026.

Record update history: Jul 17, 2026, Mar 22, 2023 (2 updates tracked since 2023).

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About Dr. Margaret Guo Md, Phd NPPES

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

DR. MARGARET GUO MD, PHD (NPI 1174225379) is an individual medical oncology provider in San Francisco, California, licensed in California (200118) and active in the NPI registry since March 2023. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1174225379

Entity TypeIndividualFemale

Primary Taxonomy207RX0202X

Provider Legal NameDR. MARGARET GUOCredential: MD, PHD

Location Address505 PARNASSUS AVE # M1480San Francisco, CA 94143-2204

Mailing Address513 Parnassus Ave # S321San Francisco, CA 94143-2205

Phone(415) 476-1000

Sole ProprietorYes

Enumeration DateMarch 20, 2023

Last NPPES UpdateJuly 17, 20262 updates tracked since enumeration

NPPES CertifiedJuly 17, 2026

✔ NPI 1174225379 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Medical OncologyAllopathic & Osteopathic Physicians

Taxonomy Code207RX0202X

License✔ Licensed in CA · 200118

Definition

An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.

505 PARNASSUS AVE # M1480, San Francisco, CA 94143

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Margaret Guo Md, Phd is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Physician 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.

New Patient

$202.35 typical visit price

range $69.00 – $202.35

Typical copayment $50.58 (range $17.25 – $50.58)

Most-billed visit code 99205

Established Patient

$119.48 typical visit price

range $23.44 – $166.46

Typical copayment $29.87 (range $5.86 – $41.61)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

NGOC-BAO LE MD