1. Home
  2. Directory
  3. Pennsylvania
  4. Titusville
  5. Internal Medicine
  6. NPI Profile

OIL VALLEY INTERNAL MEDICINE ASSOCIATES PC
NPI 1598871550
Internal Medicine in Titusville, PA

Active since August 22, 2006
339 W SPRING ST, SUITE 102, TITUSVILLE, PA 16354(814) 827-9675(814) 827-0216 Get Directions Write a Review

NPPES record last updated: December 27, 2012. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Oil Valley Internal Medicine Associates Pc NPPES

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

OIL VALLEY INTERNAL MEDICINE ASSOCIATES PC (NPI 1598871550) is a healthcare organization registered as an internal medicine in Titusville, Pennsylvania and active in the NPI registry since August 2006. The organization lists Brian A Los, President, as its authorized official.

NPPES Registry Identity

NPI1598871550
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameOIL VALLEY INTERNAL MEDICINE ASSOCIATES PC
Location Address339 W SPRING ST, SUITE 102Titusville, PA 16354
Mailing Address339 W Spring St, Suite 102Titusville, PA 16354 · (814) 827-9675 · Fax (814) 827-0216
Phone(814) 827-9675
Fax(814) 827-0216
Organization SubpartNo
Authorized OfficialBrian A LosPresident · (814) 827-9675
Enumeration DateAugust 22, 2006
Last NPPES UpdateDecember 27, 2012
✔ NPI 1598871550 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
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.
339 W SPRING ST, Titusville, PA 16354
Open in Google Maps ↗

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Oil Valley Internal Medicine Associates Pc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

5

Medicare enrollment records show 5 clinicians reassign Medicare billing to Oil Valley Internal Medicine Associates PC, which bills Medicare for the services they deliver. They are listed nearest first.

Clinicians, nearest first (5)

Stacy Kowalczyk, CRNP
Nurse Practitioner
NPI 1326077637
339 W SPRING ST SUITE 102
Titusville, PA 16354
(814) 827-9675
✔ PECOS✔ Accepts Medicare23 mi
Heidi Gaddess, CRNP
Nurse Practitioner
NPI 1023353208
339 W SPRING ST SUITE 102
Titusville, PA 16354
(814) 827-9675
✔ PECOS✔ Accepts Medicare23 mi
Brian Los, MD
Internal Medicine
NPI 1497747588
339 W SPRING ST SUITE 102
Titusville, PA 16354
(814) 827-9695
✔ PECOS✔ Accepts Medicare23 mi
Scott Mcallister, MD
Internal Medicine
NPI 1598757338
339 W SPRING ST SUITE 102
Titusville, PA 16354
(814) 827-9675
✔ PECOS✔ Accepts Medicare23 mi
Cristian Popescu, MD
Internal Medicine
NPI 1386646834
339 W SPRING ST STE 102
Titusville, PA 16354
(814) 827-9675
✔ PECOS✔ Accepts Medicare23 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 Oil Valley Internal Medicine Associates PC's NPI number?

The NPI number for Oil Valley Internal Medicine Associates PC is 1598871550. It was assigned to this organization in the NPPES registry on August 22, 2006.

Where is Oil Valley Internal Medicine Associates PC located?

Oil Valley Internal Medicine Associates PC is located at 339 W Spring St Suite 102, Titusville, PA 16354. The listed phone number is (814) 827-9675.

What is Oil Valley Internal Medicine Associates PC's specialty?

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

Is Oil Valley Internal Medicine Associates PC enrolled in Medicare?

Yes. Oil Valley Internal Medicine Associates PC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Oil Valley Internal Medicine Associates PC?

According to the CMS Revalidation Reassignment List (October 2026 release), 5 clinicians in 2 Medicare specialties reassign their Medicare billing to Oil Valley Internal Medicine Associates PC. A 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 the clinician's services. The largest specialties are Internal Medicine (3) and Nurse Practitioner (2). Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Oil Valley Internal Medicine Associates PC was last updated on December 27, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.