GRETL CHI-WING LAM M.D.
NPI 1184159253
Internal Medicine - Hospice and Palliative Medicine in Sunnyvale, CA

Q: What is Gretl Lam's NPI number?

The NPI number for Gretl Lam is 1184159253. It was assigned to this individual provider in the NPPES registry on April 26, 2017.

Q: What is Gretl Lam's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hospice and Palliative Medicine, with taxonomy code 207RH0002X.

Q: When was this NPI record last updated?

The NPPES record for Gretl Lam was last updated on September 22, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.

Active since April 26, 2017PECOS EnrolledAccepts Medicare Assignment

301 OLD SAN FRANCISCO RD, SUNNYVALE, CA 94086(408) 730-2860 Get Directions Write a Review

NPPES record last updated: September 22, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Nov 17, 2023, Jun 15, 2021, May 20, 2021 and 2 more (5 updates tracked since 2017).

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About Gretl Chi-wing Lam M.d. NPPES

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

GRETL CHI-WING LAM M.D. (NPI 1184159253) is an individual hospice and palliative medicine provider in Sunnyvale, California, licensed in California (A203145) and active in the NPI registry since April 2017. She is enrolled in Medicare PECOS and is a graduate of New York University School Of Medicine (2017).

NPPES Registry Identity

NPI1184159253

Entity TypeIndividualFemale

Primary Taxonomy207RH0002X

Provider Legal NameGRETL CHI-WING LAMCredential: M.D.

Location Address301 OLD SAN FRANCISCO RDSunnyvale, CA 94086-6386

Mailing AddressPo Box 276950Sacramento, CA 95827-6950 · (507) 284-2511

Phone(408) 730-2860

Sole ProprietorNo

Medical School CMSNew York University School Of MedicineGraduated 2017

Enumeration DateApril 26, 2017

Last NPPES UpdateSeptember 22, 20255 updates tracked since enumeration

NPPES CertifiedSeptember 22, 2025

✔ NPI 1184159253 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Hospice and Palliative MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207RH0002X

License✔ Licensed in CA · A203145

Definition

An internal medicine physician with special knowledge and skills to prevent and relieve the suffering experienced by patients with life-limiting illnesses. This specialist works with an interdisciplinary hospice or palliative care team to maximize quality of life while addressing physical, psychological, social and spiritual needs of both patient and family throughout the course of the disease, through the dying process, and beyond for the family. This specialist has expertise in the assessment of patients with advanced disease; the relief of distressing symptoms; the coordination of interdisciplinary patient and family-centered care in diverse venues; the use of specialized care systems including hospice; the management of the imminently dying patient; and legal and ethical decision making in end-of-life care.

301 OLD SAN FRANCISCO RD, Sunnyvale, CA 94086

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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 and accepts Medicare assignment

Gretl Chi-wing Lam 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 ID840540423

PECOS Enrollment IDI20250919004092

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.

Areas of Expertise CMS Part B claims 2

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

41 services22 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

31 services30 patients

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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.

DR. TAN MICHAEL NGUYEN MD

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