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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

JOSEPH ALEXANDER MACK MD
NPI 1669581880
Internal Medicine in Marietta, OH

Active since August 30, 2006PECOS Enrolled
401 MATTHEW ST, MARIETTA, OH 45750(740) 376-1994(740) 374-7701 Get Directions Write a Review

NPPES record last updated: September 22, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Sep 22, 2026, Jul 22, 2021, Aug 11, 2020 and 2 more (5 updates tracked since 2020).

About Joseph Alexander Mack Md NPPES

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

JOSEPH ALEXANDER MACK MD (NPI 1669581880) is an individual internal medicine provider in Marietta, Ohio, licensed in Ohio (35.075546) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS and maintains a secondary practice location in Marietta.

NPPES Registry Identity

NPI1669581880
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameJOSEPH ALEXANDER MACKCredential: MD
Location Address401 MATTHEW STMarietta, OH 45750-1635
Mailing AddressPo Box 449Marietta, OH 45750-0449 · (740) 374-4500 · Fax (740) 374-5887
Phone(740) 376-1994
Fax(740) 374-7701
Sole ProprietorYes
Enumeration DateAugust 30, 2006
Last NPPES UpdateSeptember 22, 20265 updates tracked since enumeration
NPPES CertifiedSeptember 22, 2026
✔ NPI 1669581880 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in OH · 35.075546
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 ListedHospitalistTaxonomy 208M00000X · License 35075546 (OH)
401 MATTHEW ST, Marietta, OH 45750
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Secondary Practice Location 1

Location 11106 Colegate DrMarietta, OH 45750-1323 · Phone (740) 374-7700 · Fax (740) 374-7701

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include CareSource.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Joseph Alexander Mack Md 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 Joseph Mack reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Marietta Memorial Hospital
Same address
General Acute Care Hospital
401 MATTHEW ST
Marietta, OH 45750
  • Reassigned Medicare billing, Ohio enrollment
  • 411 clinicians in this Medicare group
NPI 1215936927 (740) 374-1413
Selby General Hospital
1.3 mi
Critical Access
1106 COLEGATE DR
Marietta, OH 45750
  • Reassigned Medicare billing, Ohio enrollment
  • 105 clinicians in this Medicare group
NPI 1124073465 (740) 568-2040

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 45750 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
$126.12 typical visit price
range $54.34 – $166.65
Typical copayment $31.53 (range $13.58 – $41.66)
Most-billed visit code 99204
Established Patient
$96.44 typical visit price
range $17.10 – $135.40
Typical copayment $24.11 (range $4.27 – $33.85)
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.

CONSTANCE J OATES FNP
Nurse Practitioner
401 MATTHEW ST, EMERGENCY DEPARTMENT
MARIETTA, OH 45750
Washington County (740) 376-1939
JANELLE A THOMAS MD
Emergency Medicine
401 MATTHEW ST, EMERGENCY DEPT
MARIETTA, OH 45750
Washington County (740) 374-1400
LEXIE MULLEN MS, CCC-SLP
Speech-Language Pathologist
401 MATTHEW ST
MARIETTA, OH 45750
Washington County (740) 374-1422
DR. DIANA WHEELER DO
Family Medicine
401 MATTHEW ST
MARIETTA, OH 45750
Washington County (740) 374-7700
JULIAN ADAM JOHN JAKUBOWSKI DO
Emergency Medicine
401 MATTHEW ST, EMERGENCY DEPARTMENT
MARIETTA, OH 45750
Washington County (740) 376-1939
GEOFFREY SIROCKMAN DO
Emergency Medicine
401 MATTHEW ST, EMERGENCY DEPARTMENT
MARIETTA, OH 45750
Washington County (740) 568-5669
PUSHPA UPRETY FNP
Nurse Practitioner (Family)
401 MATTHEW ST
MARIETTA, OH 45750
Washington County (740) 374-1494
DR. DISHA SHAH MD
Student in an Organized Health Care Education/Training Program
401 MATTHEW ST
MARIETTA, OH 45750
Washington County (740) 374-1400

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 Joseph Mack's NPI number?

The NPI number for Joseph Mack is 1669581880. It was assigned to this individual provider in the NPPES registry on August 30, 2006.

Where is Joseph Mack located?

Joseph Mack practices at 401 Matthew St, Marietta, OH 45750. The listed phone number is (740) 376-1994.

What is Joseph Mack's specialty?

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

Is Joseph Mack enrolled in Medicare?

Yes. Joseph Mack is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Joseph Mack's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Joseph Mack reassigns Medicare benefits to 2 organizations: Marietta Memorial Hospital (Marietta, OH) and Selby General Hospital (Marietta, OH). 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 Joseph Mack's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Joseph Mack accept?

Health plans from CareSource list Joseph Mack as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Joseph Mack was last updated on September 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 28 days 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.