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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

CHARLIE POISSON LIN MD
NPI 1326542259
Internal Medicine in Castro Valley, CA

Active since March 23, 2018PECOS Enrolled
20126 STANTON AVE STE 100, CASTRO VALLEY, CA 94546(510) 537-3556 Get Directions Write a Review

NPPES record last updated: September 28, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Sep 28, 2026, Jul 26, 2024, May 27, 2021 and 1 more (4 updates tracked since 2018).

About Charlie Poisson Lin Md NPPES

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

CHARLIE POISSON LIN MD (NPI 1326542259) is an individual internal medicine provider in Castro Valley, California, licensed in California (A173959) and active in the NPI registry since March 2018. He is enrolled in Medicare PECOS, maintains a secondary practice location in Los Angeles, and is a graduate of Pennsylvania State University College Of Medicine (2018).

NPPES Registry Identity

NPI1326542259
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameCHARLIE POISSON LINCredential: MD
Location Address20126 STANTON AVE STE 100Castro Valley, CA 94546-5270
Mailing Address20126 Stanton Ave Ste 100Castro Valley, CA 94546-5270 · (510) 537-3556
Phone(510) 537-3556
Sole ProprietorYes
Medical School CMSPennsylvania State University College Of MedicineGraduated 2018
Enumeration DateMarch 23, 2018
Last NPPES UpdateSeptember 28, 20264 updates tracked since enumeration
NPPES CertifiedSeptember 28, 2026
✔ NPI 1326542259 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A173959
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedInternal Medicine · Cardiovascular DiseaseTaxonomy 207RC0000X · License A173959 (CA)
Also ListedInternal Medicine · Clinical Cardiac ElectrophysiologyTaxonomy 207RC0001X · License A173959 (CA)
20126 STANTON AVE STE 100, Castro Valley, CA 94546
Open in Google Maps ↗

Secondary Practice Location 1

Location 11510 San Pablo St Ste 300Los Angeles, CA 90033-5320 · Phone (800) 872-2273

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Charlie Poisson Lin Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID7911252366
PECOS Enrollment IDI20260819004375
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 Charlie Lin reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

University Healthcare Alliance
11 mi
Internal Medicine
7999 GATEWAY BLVD STE 200
Newark, CA 94560
  • Reassigned Medicare billing, California enrollment
  • 435 clinicians in this Medicare group
NPI 1760531198 (888) 924-1036
Stanford Health Care
11 mi
Radiation Oncology
5725 W LAS POSITAS BLVD, SUITE 100B
Pleasanton, CA 94588
  • Reassigned Medicare billing, California enrollment
  • 4,258 clinicians in this Medicare group
NPI 1124561758 (650) 723-4000

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94546 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
$153.83 typical visit price
range $69.00 – $202.35
Typical copayment $38.45 (range $17.25 – $50.58)
Most-billed visit code 99204
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 6

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

PRANEET SATYA MYLAVARAPU MD
Internal Medicine (Cardiovascular Disease)
20126 STANTON AVE STE 100
CASTRO VALLEY, CA 94546
Alameda County (510) 537-3556
STEPHEN PATRICK MORRIS MD
Internal Medicine (Cardiovascular Disease)
20126 STANTON AVE STE 100
CASTRO VALLEY, CA 94546
Alameda County (510) 537-3556
LYNNE ELIZABETH ORR NP
Nurse Practitioner
20126 STANTON AVE STE 100
CASTRO VALLEY, CA 94546
Alameda County (510) 537-3556
MEHDI HASSAN SHISHEHBOR DO
Internal Medicine (Cardiovascular Disease)
20126 STANTON AVE STE 100
CASTRO VALLEY, CA 94546
Alameda County (510) 537-3556
JEFFREY ALAN WEST MD
Internal Medicine (Cardiovascular Disease)
20126 STANTON AVE STE 100
CASTRO VALLEY, CA 94546
Alameda County (510) 537-3556
ADITYA VINAY VAZE MD
Internal Medicine (Cardiovascular Disease)
20126 STANTON AVE STE 100
CASTRO VALLEY, CA 94546
Alameda County (510) 537-3556

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 Charlie Lin's NPI number?

The NPI number for Charlie Lin is 1326542259. It was assigned to this individual provider in the NPPES registry on March 23, 2018.

Where is Charlie Lin located?

Charlie Lin practices at 20126 Stanton Ave Ste 100, Castro Valley, CA 94546. The listed phone number is (510) 537-3556.

What is Charlie Lin's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Charlie Lin enrolled in Medicare?

Yes. Charlie Lin is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Charlie Lin's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Charlie Lin reassigns Medicare benefits to 2 organizations: University Healthcare Alliance (Newark, CA) and Stanford Health Care (Pleasanton, 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 Charlie Lin'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 Charlie Lin was last updated on September 28, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 35 days 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.