1. Home
  2. Directory
  3. California
  4. Thermal
  5. Family Medicine
  6. NPI Profile

NATHAN WILLIAMS
NPI 1548345473
Family Medicine - Adult Medicine in Thermal, CA

Active since October 26, 2006PECOS EnrolledAccepts Medicare Assignment
66735 MARTINEZ ST, THERMAL, CA 92274(800) 717-4476 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: November 08, 2026.

About Nathan Williams NPPES

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

NATHAN WILLIAMS (NPI 1548345473) is an individual adult medicine provider in Thermal, California, licensed in California (A79720) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS and is a graduate of Loma Linda University School Of Medicine (2000).

NPPES Registry Identity

NPI1548345473
Entity TypeIndividualMale
Primary Taxonomy207QA0505X
Provider Legal NameNATHAN WILLIAMS
Location Address66735 MARTINEZ STThermal, CA 92274-9007
Mailing Address12197 White Rock DrRancho Cucamonga, CA 91739-9079 · (909) 899-7442
Phone(800) 717-4476
Sole ProprietorNo
Medical School CMSLoma Linda University School Of MedicineGraduated 2000
Enumeration DateOctober 26, 2006
Last NPPES UpdateJuly 8, 2007
✔ NPI 1548345473 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily Medicine · Adult MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207QA0505X
License✔ Licensed in CA · A79720
Definition
The National Uniform Claim Committee (NUCC) recommends code 207QA0505X not be used. Choose a more appropriate code.
66735 MARTINEZ ST, Thermal, CA 92274
Open in Google Maps ↗

Other Identifiers 1

Medicare UPINH94231CA

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Nathan Williams 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 ID840209946
PECOS Enrollment IDI20060418000689
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 Reassignment

Medicare enrollment records show Nathan Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Impact Care Access Network Inc
88 mi
Primary Care
9390 HESPERIA RD, SUITE # 7
Hesperia, CA 92345
  • Reassigned Medicare billing, California enrollment
  • 3 clinicians in this Medicare group
NPI 1861858904 (760) 998-2125

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 92274 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
$91.88 typical visit price
range $59.60 – $179.42
Typical copayment $22.97 (range $14.90 – $44.85)
Most-billed visit code 99203
Established Patient
$104.64 typical visit price
range $19.37 – $146.42
Typical copayment $26.16 (range $4.84 – $36.60)
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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

Reported Quality Measures

Breast Cancer Screening
48%29 patients3/55-star benchmark: 93%
Cervical Cancer Screening
37%46 patients2/55-star benchmark: 98%
Colorectal Cancer Screening
25%64 patients2/55-star benchmark: 88%
Controlling High Blood Pressure
58%31 patients3/55-star benchmark: 91%
Diabetes: Eye Exam
0%32 patients1/55-star benchmark: 100%
Diabetes: Hemoglobin A1c (HbA1c) Poor Control (>9%)
Lower rates are better for this measure.
19%32 patients4/55-star benchmark: 91%
Documentation of Current Medications in the Medical Record
73%229 patients3/55-star benchmark: 100%
Falls: Screening for Future Fall Risk
0%30 patients1/55-star benchmark: 100%
Preventive Care and Screening: Body Mass Index (BMI) Screening and Follow-Up Plan
35%131 patients2/55-star benchmark: 98%
Preventive Care and Screening: Screening for Depression and Follow-Up Plan
29%114 patients2/55-star benchmark: 97%
Preventive Care and Screening: Screening for High Blood Pressure and Follow-Up Documented
30%142 patients2/55-star benchmark: 61%
Preventive Care and Screening: Tobacco Use: Screening and Cessation Intervention
Patients screened: 42% · 57 patients
40%57 patients
Statin Therapy for the Prevention and Treatment of Cardiovascular Disease
53%53 patients2/55-star benchmark: 91%
Use of High-Risk Medications in Older Adults
Lower rates are better for this measure.
Patients appropriateDiagnosis: 0% · 36 patients
Patients totalRate: 11% · 36 patients
11%36 patients3/55-star benchmark: 100%
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

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 Nathan Williams's NPI number?

The NPI number for Nathan Williams is 1548345473. It was assigned to this individual provider in the NPPES registry on October 26, 2006.

Where is Nathan Williams located?

Nathan Williams practices at 66735 Martinez St, Thermal, CA 92274. The listed phone number is (800) 717-4476.

What is Nathan Williams's specialty?

The primary specialty registered for this NPI is Family Medicine, specializing in Adult Medicine, with taxonomy code 207QA0505X.

Is Nathan Williams enrolled in Medicare?

Yes. Nathan Williams is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Nathan Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Nathan Williams reassigns Medicare benefits to Impact Care Access Network Inc (Hesperia, CA). The 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 Nathan Williams'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 Nathan Williams was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.