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CHELSEA A HASTINGS D.O.
NPI 1942654371
Pediatrics in Larkspur, CA

Active since April 22, 2016PECOS Enrolled
1100 LARKSPUR LANDING CIR STE 10, LARKSPUR, CA 94939(415) 464-1350 Get Directions Write a Review

NPPES record last updated: April 4, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Apr 4, 2025, May 3, 2019, Mar 5, 2019 (3 updates tracked since 2019).

About Chelsea A Hastings D.o. NPPES

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

CHELSEA A HASTINGS D.O. (NPI 1942654371) is an individual pediatrics provider in Larkspur, California, licensed in California (20A20173) and active in the NPI registry since April 2016. She is enrolled in Medicare PECOS and maintains a secondary practice location in Boston.

NPPES Registry Identity

NPI1942654371
Entity TypeIndividualFemale
Primary Taxonomy208000000X
Provider Legal NameCHELSEA A HASTINGSCredential: D.O.
Location Address1100 LARKSPUR LANDING CIR STE 10Larkspur, CA 94939-1836
Mailing Address1100 Larkspur Landing Cir Ste 10Larkspur, CA 94939-1836 · (415) 464-1350
Phone(415) 464-1350
Sole ProprietorNo
Enumeration DateApril 22, 2016
Last NPPES UpdateApril 4, 20253 updates tracked since enumeration
NPPES CertifiedApril 4, 2025
✔ NPI 1942654371 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
Licenses✔ Licensed in CA · 20A20173✔ Licensed in MA · 279343
Definition
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
1100 LARKSPUR LANDING CIR STE 10, Larkspur, CA 94939
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Other Names 1

Former Name (1)Chelsea Wells D.o.

Secondary Practice Location 1

Location 1300 Longwood AveBoston, MA 02115-5724 · Phone (617) 355-6000

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Chelsea A Hastings D.o. 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.

Medicare Billing Reassignments

3

Medicare enrollment records show Chelsea Hastings reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Permanente Medical Group Inc
8.2 mi
Internal Medicine
901 NEVIN
Richmond, CA 94801
  • Reassigned Medicare billing, California enrollment
  • 20,078 clinicians in this Medicare group
NPI 1235226531 (510) 307-1555
Dignity Health
153 mi
Multi-Specialty
2340 LIBERTY PKWY STE 200
Red Bluff, CA 96080
  • Reassigned Medicare billing, California enrollment
  • 131 clinicians in this Medicare group
NPI 1134687734 (530) 529-7760
Children's Hospital Pediatric Associates, Inc
2,697 mi
Pediatrics
300 LONGWOOD AVE
Boston, MA 02115
  • Reassigned Medicare billing, Massachusetts enrollment
  • 1,358 clinicians in this Medicare group
NPI 1457306664 (617) 355-6000

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 94939 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
$104.67 typical visit price
range $69.07 – $202.63
Typical copayment $26.16 (range $17.26 – $50.65)
Most-billed visit code 99203
Established Patient
$119.61 typical visit price
range $23.44 – $166.64
Typical copayment $29.90 (range $5.86 – $41.66)
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 12

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

INJIL ABUBAKAR MD
Family Medicine
1100 LARKSPUR LANDING CIR STE 10
LARKSPUR, CA 94939
Marin County (415) 924-1214
MERRILL RALPH NISAM MD
Internal Medicine (Pulmonary Disease)
1100 LARKSPUR LANDING CIR STE 10
LARKSPUR, CA 94939
Marin County (415) 924-1214
WILLIE TANG MD
Internal Medicine
1100 LARKSPUR LANDING CIR STE 10
LARKSPUR, CA 94939
Marin County (415) 924-1214
MICHELLE LOW DO
Internal Medicine (Pulmonary Disease)
1100 LARKSPUR LANDING CIR STE 10
LARKSPUR, CA 94939
Marin County (415) 924-1214
DR. JOHN MICHAEL GRAHAM M.D.
Family Medicine
1100 LARKSPUR LANDING CIR STE 10
LARKSPUR, CA 94939
Marin County (415) 924-1214
LIA ARMSTRONG WYSTRACH BSN, RN, MN, FNP-C
Nurse Practitioner (Family)
1100 LARKSPUR LANDING CIR STE 10
LARKSPUR, CA 94939
Marin County (415) 924-1214
ANJULI MAYA BRIGHTON MD
Internal Medicine (Pulmonary Disease)
1100 LARKSPUR LANDING CIR STE 10
LARKSPUR, CA 94939
Marin County (415) 924-1214
ROBERT DORIS
Internal Medicine
1100 LARKSPUR LANDING CIR STE 10
LARKSPUR, CA 94939
Marin County (415) 924-1214

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 Chelsea Hastings's NPI number?

The NPI number for Chelsea Hastings is 1942654371. It was assigned to this individual provider in the NPPES registry on April 22, 2016. The provider is also known as Chelsea Wells D.O..

Where is Chelsea Hastings located?

Chelsea Hastings practices at 1100 Larkspur Landing Cir Ste 10, Larkspur, CA 94939. The listed phone number is (415) 464-1350.

What is Chelsea Hastings's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is Chelsea Hastings enrolled in Medicare?

Yes. Chelsea Hastings is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Chelsea Hastings's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Chelsea Hastings reassigns Medicare benefits to 3 organizations: Permanente Medical Group Inc (Richmond, CA), Dignity Health (Red Bluff, CA) and Children's Hospital Pediatric Associates, Inc (Boston, MA). 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 Chelsea Hastings'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 Chelsea Hastings was last updated on April 4, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.