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DR. ANDREW TZELLAS M.D
NPI 1003996042
Internal Medicine in Napa, CA

Active since October 16, 2006PECOS Enrolled
1141 PEAR TREE LN STE 100, NAPA, CA 94558(707) 254-1770 Get Directions Write a Review

NPPES record last updated: November 27, 2023. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Aug 21, 2023, Feb 7, 2023 (2 updates tracked since 2023).

About Dr. Andrew Tzellas M.d NPPES

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

DR. ANDREW TZELLAS M.D (NPI 1003996042) is an individual internal medicine provider in Napa, California, licensed in California (C183605) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1003996042
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. ANDREW TZELLASCredential: M.D
Location Address1141 PEAR TREE LN STE 100Napa, CA 94558-6485
Mailing Address1 Gold St Apt 5gHartford, CT 06103-2930 · (917) 885-9048
Phone(707) 254-1770
Sole ProprietorYes
Enumeration DateOctober 16, 2006
Last NPPES UpdateNovember 27, 20232 updates tracked since enumeration
NPPES CertifiedNovember 10, 2023
✔ NPI 1003996042 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in CA · C183605✔ Licensed in CT · 052165
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.
Also ListedFamily MedicineTaxonomy 207Q00000X · License 236059 (NY)
Also ListedClinic/Center · Multi-SpecialtyTaxonomy 261QM1300X · License 236059 (NY)
1141 PEAR TREE LN STE 100, Napa, CA 94558
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Other Identifiers 1

Medicaid008045654CT

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Andrew Tzellas 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.

Medicare Billing Reassignments

2

Medicare enrollment records show Andrew Tzellas reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Family Health Centers Of San Diego, Inc
476 mi
Federally Qualified Health Center (FQHC)
3705 MISSION BLVD
San Diego, CA 92109
  • Reassigned Medicare billing, California enrollment
  • 1,100 clinicians in this Medicare group
NPI 1386689701 (619) 515-2444
Kaiser Foundation Health Plan Of The Northwest
498 mi
General Practice
500 NE MULTNOMAH ST
Portland, OR 97232
  • Reassigned Medicare billing, Washington enrollment
  • 2,534 clinicians in this Medicare group
NPI 1871848457 (503) 823-2440

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 94558 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
$145.99 typical visit price
range $65.08 – $192.16
Typical copayment $36.49 (range $16.27 – $48.04)
Most-billed visit code 99204
Established Patient
$113.15 typical visit price
range $21.86 – $157.83
Typical copayment $28.28 (range $5.46 – $39.45)
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.

Referred Medical Equipment & Supplies CMS DME claims

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
8 suppliers39 claims102 services$6.33 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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.

MS. ROSALEE M. KAMPER R.D,
Dietitian, Registered
1141 PEAR TREE LN STE 100
NAPA, CA 94558
Napa County (707) 254-1770
ALEJANDRA DELAGUA
Social Worker
1141 PEAR TREE LN STE 100
NAPA, CA 94558
Napa County (707) 254-1770
MICHELE CARLSON
Registered Nurse
1141 PEAR TREE LN STE 100
NAPA, CA 94558
Napa County (707) 254-1774
MORGAN MARIE-CLAUDE PESSEREAU PA-C
Physician Assistant
1141 PEAR TREE LN STE 100
NAPA, CA 94558
Napa County (707) 254-1770
KRISTINE HIMMERICK PA
Physician Assistant
1141 PEAR TREE LN STE 100
NAPA, CA 94558
Napa County (707) 254-1770
DR. MICHAEL JOHN KUCSERA DDS
Dentist
1141 PEAR TREE LN STE 100
NAPA, CA 94558
Napa County (707) 258-6128
FRANK ALBERT GRAN RN
Registered Nurse
1141 PEAR TREE LN STE 100
NAPA, CA 94558
Napa County (707) 254-1770
ROSA ELENA OLMOS
Social Worker
1141 PEAR TREE LN STE 100
NAPA, CA 94558
Napa County (707) 254-1770

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 Andrew Tzellas's NPI number?

The NPI number for Andrew Tzellas is 1003996042. It was assigned to this individual provider in the NPPES registry on October 16, 2006.

Where is Andrew Tzellas located?

Andrew Tzellas practices at 1141 Pear Tree Ln Ste 100, Napa, CA 94558. The listed phone number is (707) 254-1770.

What is Andrew Tzellas's specialty?

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

Is Andrew Tzellas enrolled in Medicare?

Yes. Andrew Tzellas is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Andrew Tzellas's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Andrew Tzellas reassigns Medicare benefits to 2 organizations: Family Health Centers Of San Diego, Inc (San Diego, CA) and Kaiser Foundation Health Plan Of The Northwest (Portland, OR). Each 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 Andrew Tzellas'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 Andrew Tzellas was last updated on November 27, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.