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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.

DR. CHARLENE B. SPENCER M.D.
NPI 1821037367
Hospitalist in Walnut Creek, CA

Active since June 06, 2006Opted out of Medicare · through Jan 1, 2027
801 YGNACIO VALLEY RD, SUITE 250, WALNUT CREEK, CA 94596(925) 946-1080(925) 946-9717 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Charlene B. Spencer M.d. NPPES

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

DR. CHARLENE B. SPENCER M.D. (NPI 1821037367) is an individual hospitalist provider in Walnut Creek, California, licensed in California (G83176) and active in the NPI registry since June 2006. She has opted out of Medicare through January 1, 2027 and remains eligible to order and refer.

NPPES Registry Identity

NPI1821037367
Entity TypeIndividualFemale
Primary Taxonomy208M00000X
Provider Legal NameDR. CHARLENE B. SPENCERCredential: M.D.
Location Address801 YGNACIO VALLEY RD, SUITE 250Walnut Creek, CA 94596-3871
Mailing Address801 Ygnacio Valley Rd, Suite 250Walnut Creek, CA 94596-3871 · (925) 946-1080 · Fax (925) 946-9717
Phone(925) 946-1080
Fax(925) 946-9717
Sole ProprietorNo
Enumeration DateJune 6, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1821037367 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyHospitalistAllopathic & Osteopathic Physicians
Taxonomy Code208M00000X
License✔ Licensed in CA · G83176
Definition
Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients.
801 YGNACIO VALLEY RD, Walnut Creek, CA 94596
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Dr. Charlene B. Spencer M.d. has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from January 1, 2013 through January 1, 2027.

Opt-Out Effective DateJanuary 1, 2013
Opt-Out In Effect ThroughJanuary 1, 2027Opt-out affidavits renew automatically every two years unless cancelled
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94596 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 7

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

DR. NICETO LOPEZ MD
Hospitalist
801 YGNACIO VALLEY RD, SUITE 250
WALNUT CREEK, CA 94596
Contra Costa County (925) 946-1080
DR. KURUKULASOORIYA FERNANDO MD
Hospitalist
801 YGNACIO VALLEY RD, SUITE 250
WALNUT CREEK, CA 94596
Contra Costa County (925) 946-1080
DR. DOUGLAS BOAKYE DO
Hospitalist
801 YGNACIO VALLEY RD, SUITE 250
WALNUT CREEK, CA 94596
Contra Costa County (925) 946-1080
OPTIMAL PERFORMANCE PHYSICAL THERAPY
Physical Therapist
801 YGNACIO VALLEY RD, STE. 200
WALNUT CREEK, CA 94596
Contra Costa County (925) 945-6778
MS. MAHSA MODARRES SABZEVARI MSPT
Physical Therapist (Orthopedic)
801 YGNACIO VALLEY RD, SUITE 200
WALNUT CREEK, CA 94596
Contra Costa County (925) 945-6778
DR. PETER HAMLIN ROWE M.D.
Hospitalist
801 YGNACIO VALLEY RD, SUITE 250
WALNUT CREEK, CA 94596
Contra Costa County (925) 946-1080
GAYLE L ANDERSON RPT
Physical Therapist
801 YGNACIO VALLEY RD, STE. 200
WALNUT CREEK, CA 94596
Contra Costa County (925) 945-6778

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 Charlene Spencer's NPI number?

The NPI number for Charlene Spencer is 1821037367. It was assigned to this individual provider in the NPPES registry on June 6, 2006.

Where is Charlene Spencer located?

Charlene Spencer practices at 801 Ygnacio Valley Rd Suite 250, Walnut Creek, CA 94596. The listed phone number is (925) 946-1080.

What is Charlene Spencer's specialty?

The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.

Is Charlene Spencer enrolled in Medicare?

No. Charlene Spencer has opted out of Medicare through January 1, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Charlene Spencer was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 30 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.