1. Home
  2. Directory
  3. California
  4. Roseville
  5. Internal Medicine
  6. NPI Profile

DR. GREGORY NAUGHTON M.D.
NPI 1578889507
Internal Medicine in Roseville, CA

Active since April 15, 2010PECOS EnrolledAccepts Medicare Assignment
1600 EUREKA RD, ROSEVILLE, CA 95661(916) 474-6590(916) 474-6591 Get Directions Write a Review

NPPES record last updated: December 15, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Dec 15, 2021, Feb 19, 2016 (2 updates tracked since 2016).

About Dr. Gregory Naughton M.d. NPPES

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

DR. GREGORY NAUGHTON M.D. (NPI 1578889507) is an individual internal medicine provider in Roseville, California, licensed in California (A118860) and active in the NPI registry since April 2010. He is enrolled in Medicare PECOS and is a graduate of Other (2010).

NPPES Registry Identity

NPI1578889507
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. GREGORY NAUGHTONCredential: M.D.
Location Address1600 EUREKA RDRoseville, CA 95661-3027
Mailing Address1600 Eureka RdRoseville, CA 95661-3027 · (916) 474-6590 · Fax (916) 474-6591
Phone(916) 474-6590
Fax(916) 474-6591
Sole ProprietorNo
Medical School CMSOtherGraduated 2010
Enumeration DateApril 15, 2010
Last NPPES UpdateDecember 15, 20212 updates tracked since enumeration
✔ NPI 1578889507 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A118860
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.
1600 EUREKA RD, Roseville, CA 95661
Open in Google Maps ↗

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

Dr. Gregory Naughton M.d. 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 ID6507005147
PECOS Enrollment IDI20130612000181
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 Gregory Naughton reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Permanente Medical Group Inc
50 mi
Internal Medicine
7373 WEST LANE
Stockton, CA 95210
  • Reassigned Medicare billing, California enrollment
  • 20,078 clinicians in this Medicare group
NPI 1548343510 (209) 476-2000

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 95661 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
$137.20 typical visit price
range $60.44 – $180.85
Typical copayment $34.30 (range $15.11 – $45.21)
Most-billed visit code 99204
Established Patient
$105.95 typical visit price
range $19.88 – $148.15
Typical copayment $26.48 (range $4.97 – $37.03)
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 20

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

DR. VESNA IVANCIC COCHELL MD
Urology
1600 EUREKA RD
ROSEVILLE, CA 95661
Placer County (916) 784-4000
LYNN TUYET NGUYEN PHARM.D
Pharmacist
1600 EUREKA RD
ROSEVILLE, CA 95661
Placer County (916) 784-4000
MR. BRYCE PHILLIP CARTWRIGHT PHYSICAL THERAPIST
Physical Therapist
1600 EUREKA RD
ROSEVILLE, CA 95661
Placer County (916) 784-4954
QUAN T. NGUYEN MD
Hospitalist
1600 EUREKA RD
ROSEVILLE, CA 95661
Placer County (916) 784-4000
JAMES H. HEYKES MD
Internal Medicine
1600 EUREKA RD
ROSEVILLE, CA 95661
Placer County (916) 784-4000
MS. LINDA ROSE BROWN NP
Nurse Practitioner (Women's Health)
1600 EUREKA RD, WOMEN'S HEALTH , PERMANENTE MEDICAL GROUP
ROSEVILLE, CA 95661
Placer County (916) 784-5003
SCOTT W. ADAMS MD
Pediatrics (Pediatric Hematology-Oncology)
1600 EUREKA RD
ROSEVILLE, CA 95661
Placer County (916) 784-4000
CAROL LYNN SCHULZ PHARM.D.
Pharmacist
1600 EUREKA RD
ROSEVILLE, CA 95661
Placer County (916) 784-4184

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 Gregory Naughton's NPI number?

The NPI number for Gregory Naughton is 1578889507. It was assigned to this individual provider in the NPPES registry on April 15, 2010.

Where is Gregory Naughton located?

Gregory Naughton practices at 1600 Eureka Rd, Roseville, CA 95661. The listed phone number is (916) 474-6590.

What is Gregory Naughton's specialty?

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

Is Gregory Naughton enrolled in Medicare?

Yes. Gregory Naughton 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 Gregory Naughton's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Naughton reassigns Medicare benefits to Permanente Medical Group Inc (Stockton, 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 Gregory Naughton'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 Gregory Naughton was last updated on December 15, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.