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DR. MATTHEW ALEXANDER STACK MD
NPI 1962994491
Internal Medicine - Infectious Disease in Houston, TX

Active since May 31, 2018PECOS EnrolledAccepts Medicare Assignment
6431 FANNIN ST # 2.112, HOUSTON, TX 77030(713) 500-6765(713) 500-5495 Get Directions Write a Review

NPPES record last updated: May 19, 2024. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: May 19, 2024, Mar 25, 2023 (2 updates tracked since 2023).

About Dr. Matthew Alexander Stack Md NPPES

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

DR. MATTHEW ALEXANDER STACK MD (NPI 1962994491) is an individual infectious disease provider in Houston, Texas, licensed in Texas (BP10082502) and active in the NPI registry since May 2018. He is enrolled in Medicare PECOS, is affiliated with Ssm Health St Mary's Hospital -centralia, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1962994491
Entity TypeIndividualMale
Primary Taxonomy207RI0200X
Provider Legal NameDR. MATTHEW ALEXANDER STACKCredential: MD
Location Address6431 FANNIN ST # 2.112Houston, TX 77030-1501
Mailing Address6431 Fannin St # 2.112Houston, TX 77030-1501 · (713) 500-6765 · Fax (713) 500-5495
Phone(713) 500-6765
Fax(713) 500-5495
Sole ProprietorNo
Medical School CMSWayne State University School Of MedicineGraduated 2018
Enumeration DateMay 31, 2018
Last NPPES UpdateMay 19, 20242 updates tracked since enumeration
NPPES CertifiedMay 19, 2024
✔ NPI 1962994491 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Infectious DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RI0200X
License✔ Licensed in TX · BP10082502
Definition
An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X · License 11020118A (IN)
6431 FANNIN ST # 2.112, Houston, TX 77030
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Secondary Practice Locations 2

Location 11008 S Spring AveSaint Louis, MO 63110-2520 · Phone (314) 617-3137 · Fax (314) 977-3127
Location 21120 W Michigan StIndianapolis, IN 46202-5209 · Phone (317) 278-2694 · Fax (317) 278-2650

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan, Ambetter Health and more.Insurance ›

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. Matthew Alexander Stack Md 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 ID5991050577
PECOS Enrollment IDI20240809000740, I20251208001842
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 Matthew Stack reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Ssm Health Care Group
681 mi
Internal Medicine
1225 SOUTH GRAND BLVD, 2L - DOOR 3,4
Saint Louis, MO 63104
  • Reassigned Medicare billing, Missouri enrollment
  • 1,294 clinicians in this Medicare group
NPI 1306589544 (314) 977-6100
Physician Services Corporation Of Southern Illinois Inc.
699 mi
Internal Medicine
4218 LINCOLNSHIRE DR
Mount Vernon, IL 62864
  • Reassigned Medicare billing, Illinois enrollment
  • 296 clinicians in this Medicare group
NPI 1831101807 (618) 899-3600

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

Areas of Expertise CMS Part B claims

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
29 services11 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Ssm Health St Mary's Hospital -Centralia

Acute Care Hospitals · Centralia, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number140034
Location400 North Pleasant AvenueCentralia, IL 62801 · Marion County
Emergency services

Good Samaritan Regional Hlth Center

Acute Care Hospitals · Mount Vernon, IL
2/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140046
Location1 Good Samaritan WayMount Vernon, IL 62864 · Jefferson County
Emergency services Birthing friendly

Ssm Health St Mary's Hospital Jefferson City

Acute Care Hospitals · Jefferson City, MO
3/5 CMS rating
OwnershipProprietary
CMS Certification Number260011
Location2505 Mission DriveJefferson City, MO 65109 · Cole County
Emergency services Birthing friendly

Ssm Health Saint Louis University Hospital

Acute Care Hospitals · Saint Louis, MO
1/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number260105
Location3635 Vista AveSaint Louis, MO 63110 · St. Louis City County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 77030 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
$134.06 typical visit price
range $58.24 – $176.98
Typical copayment $33.51 (range $14.56 – $44.24)
Most-billed visit code 99204
Established Patient
$102.71 typical visit price
range $18.60 – $143.93
Typical copayment $25.67 (range $4.65 – $35.98)
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 9

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

AAMIR SIKANDER KAZI M.D.
Student in an Organized Health Care Education/Training Program
6431 FANNIN ST # 2.112
HOUSTON, TX 77030
Harris County (713) 500-6765
BARAA SAAD MD
Internal Medicine (Infectious Disease)
6431 FANNIN ST # 2.112
HOUSTON, TX 77030
Harris County (713) 500-6767
YUSUKE OHASHI MD
Student in an Organized Health Care Education/Training Program
6431 FANNIN ST # 2.112
HOUSTON, TX 77030
Harris County (713) 500-6767
AKI SAKURAI MD
Student in an Organized Health Care Education/Training Program
6431 FANNIN ST # 2.112
HOUSTON, TX 77030
Harris County (713) 500-6765
UNIVERSITY OF TEXAS
General Acute Care Hospital
6431 FANNIN ST # 2.112
HOUSTON, TX 77030
Harris County (713) 500-6765
JOSE MANUEL MUNITA M.D.
Student in an Organized Health Care Education/Training Program
6431 FANNIN ST # 2.112
HOUSTON, TX 77030
Harris County (713) 500-6765
DR. HECTOR DAVID PRECIADO MD
Student in an Organized Health Care Education/Training Program
6431 FANNIN ST # 2.112
HOUSTON, TX 77030
Harris County (713) 500-6767
PABLO ANDRES GONZALEZ MD
Student in an Organized Health Care Education/Training Program
6431 FANNIN ST # 2.112
HOUSTON, TX 77030
Harris County (713) 500-6767

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 Matthew Stack's NPI number?

The NPI number for Matthew Stack is 1962994491. It was assigned to this individual provider in the NPPES registry on May 31, 2018.

Where is Matthew Stack located?

Matthew Stack practices at 6431 Fannin St # 2.112, Houston, TX 77030. The listed phone number is (713) 500-6765.

What is Matthew Stack's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.

Is Matthew Stack enrolled in Medicare?

Yes. Matthew Stack 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 organizations bill Medicare for Matthew Stack's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Matthew Stack reassigns Medicare benefits to 2 organizations: Ssm Health Care Group (Saint Louis, MO) and Physician Services Corporation Of Southern Illinois Inc. (Mount Vernon, IL). 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 Matthew Stack's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Matthew Stack accept?

Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan and Ambetter of Oklahoma and 4 other insurers list Matthew Stack 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.

Is Matthew Stack affiliated with any hospitals?

According to CMS data, Matthew Stack is affiliated with Ssm Health St Mary's Hospital -Centralia, Good Samaritan Regional Hlth Center, Ssm Health St Mary's Hospital Jefferson City and Ssm Health Saint Louis University Hospital.

When was this NPI record last updated?

The NPPES record for Matthew Stack was last updated on May 19, 2024. 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.