1. Home
  2. Directory
  3. California
  4. Livermore
  5. Dentist
  6. NPI Profile

DR. HARLEY JILL WILLIAMS D.M.D.
NPI 1013190255
Dentist - Periodontics in Livermore, CA

Active since December 11, 2007PECOS Enrolled
999 E STANLEY BLVD, LIVERMORE, CA 94550(925) 371-0300(925) 371-0800 Get Directions Write a Review

NPPES record last updated: December 11, 2007. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. Harley Jill Williams D.m.d. NPPES

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

DR. HARLEY JILL WILLIAMS D.M.D. (NPI 1013190255) is an individual periodontics provider in Livermore, California, licensed in California (39109) and active in the NPI registry since December 2007. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1013190255
Entity TypeIndividualFemale
Primary Taxonomy1223P0300X
Provider Legal NameDR. HARLEY JILL WILLIAMSCredential: D.M.D.
Location Address999 E STANLEY BLVDLivermore, CA 94550-4002
Mailing Address999 E Stanley BlvdLivermore, CA 94550-4002 · (925) 371-0300 · Fax (925) 371-0800
Phone(925) 371-0300
Fax(925) 371-0800
Sole ProprietorYes
Enumeration DateDecember 11, 2007
✔ NPI 1013190255 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentist · PeriodonticsDental Providers
Taxonomy Code1223P0300X
License✔ Licensed in CA · 39109
Definition
That specialty of dentistry which encompasses the prevention, diagnosis and treatment of diseases of the supporting and surrounding tissues of the teeth or their substitutes and the maintenance of the health, function and esthetics of these structures and tissues.
999 E STANLEY BLVD, Livermore, CA 94550
Open in Google Maps ↗

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. Harley Jill Williams D.m.d. 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 94550 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
$104.51 typical visit price
range $69.00 – $202.35
Typical copayment $26.12 (range $17.25 – $50.58)
Most-billed visit code 99203
Established Patient
$84.91 typical visit price
range $23.44 – $166.46
Typical copayment $21.22 (range $5.86 – $41.61)
Most-billed visit code 99213
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 3

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

DR. MAX HSIAO DMD
Dentist (General Practice)
999 E STANLEY BLVD
LIVERMORE, CA 94550
Alameda County (925) 449-1141
DR. ANTHONY DAVID ALVAREZ DDS
Dentist
999 E STANLEY BLVD, SUITE A
LIVERMORE, CA 94550
Alameda County (925) 443-3443
DR. STEVEN MARK WILLIAMS D.M.D.
Dentist (Endodontics)
999 E STANLEY BLVD, STE. C
LIVERMORE, CA 94550
Alameda County (925) 371-0300

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 Harley Williams's NPI number?

The NPI number for Harley Williams is 1013190255. It was assigned to this individual provider in the NPPES registry on December 11, 2007.

Where is Harley Williams located?

Harley Williams practices at 999 E Stanley Blvd, Livermore, CA 94550. The listed phone number is (925) 371-0300.

What is Harley Williams's specialty?

The primary specialty registered for this NPI is Dentist, specializing in Periodontics, with taxonomy code 1223P0300X.

Is Harley Williams enrolled in Medicare?

Yes. Harley Williams is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Harley Williams was last updated on December 11, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 years 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.