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Internal Medicine

Michael A. Hattwick, MD

Sees patients in Manassas, VA · Virginia

Summary

Michael A. Hattwick, MD (Internal Medicine) is enrolled with Medicare at 1 practice location in Manassas, VA. NPI 1356496988. Medicare data says the clinician accepts Medicare assignment. Source: CMS National Downloadable File, updated 2026-10-02.

Call(571) 459‑2960 NPI Registry record Medicare profile

From official Medicare data

This page shows what Medicare's official clinician data says about Michael A. Hattwick, joined by NPI number (data updated 2026-10-02). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

At a glance

1Practice location
Internal MedicinePrimary specialty
YesAccepts Medicare assignment
YesOffers telehealth
58Years since medical school (graduated 1968)
Baylor College Of MedicineMedical school
MaleGender (as listed)

Quick answers

Where does Michael A. Hattwick see patients?
Medicare's clinician data lists 1 practice location in Manassas, VA. Call before your visit to confirm the address.
What is Michael A. Hattwick's specialty?
Medicare lists Internal Medicine as the primary specialty, and also Preventive Medicine.
Does Michael A. Hattwick accept Medicare assignment?
Yes. Medicare's clinician data says Michael A. Hattwick accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
Does Michael A. Hattwick offer telehealth?
Medicare's clinician data says Michael A. Hattwick offers telehealth services. Ask the office which visits can be done by video or phone.
What is the phone number for Michael A. Hattwick?
(571) 459-2960, as listed in official Medicare / NPI Registry data.
What is Michael A. Hattwick's NPI number?
1356496988. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.

Practice locations

Addresses where Michael A. Hattwick is enrolled with Medicare (CMS data updated 2026-10-02).

Specialties

Find other Internal Medicine doctors in Virginia →

Other internal medicine doctors in Manassas

Clinicians with the same Medicare primary specialty in Manassas, VA — not a recommendation.

All internal medicine doctors in Manassas →

Clinician information

CredentialMD
Medical schoolBaylor College Of Medicine
Graduation year1968
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
TelehealthOffers telehealth services
NPI (National Provider Identifier)1356496988
CorrectionsReport an error or suggest an update →

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

  1. National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
  2. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  3. Medicare Care Compare — official Medicare tool to look up clinicians