John Michael Halwig, MD
Allergy Physician · Austell, GA
John Michael Halwig, MD is an allergy physician with a practice address in Austell, Georgia, and NPI 1841230760, issued on Jun 8, 2006. Check the license (Georgia 27558, as entered in NPPES) on the Georgia Composite Medical Board; the Medicare figures below come from public CMS files.
- Name
- John Michael Halwig
- Credential
- MD
- Primary taxonomy
- Allergy Physician 207KA0200X
- License number
- 27558 GA
Self-reported in NPPES; status is on the state search - Practice location
- 1620 Mulkey RD, Austell, GA 30106
- Phone
- (770) 953-3331
- Enumerated
- Jun 8, 2006
- Record last updated
- Nov 12, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (770) 739-9609
- Entity
- Type 1 · individual
8 nearest allergy physician records → All 23 in Georgia → Look up another NPI →
Also registered at 1620 Mulkey RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Maricelis Armstrong, MDAllergy & Immunology Physician1932149853
- Susan Berkowitz, FNP-BCNurse Practitioner1891814422
- William Carroll, D.D.S.Dentist1306963715
- Mary LockeFamily Nurse Practitioner1376930404
Verify John Michael Halwig in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersGeorgia Composite Medical Board
Search for license 27558Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average allergy physician in 2024
30 Medicare Part D claims, against an average of 750 among the 645 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
John Michael Halwig among 23 allergy physician records in Georgia
John Michael Halwig, MD is one of 23 allergy physician records with a practice address in Georgia. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 13% of them.
- NPI issued2006 · 13% of these records are older, 26% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 70% of these records are
- Record last updated2020 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207KA0200X and a Georgia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Allergy Physician providers in Georgia
There are 23 allergy physician records in Georgia.
All 23 in Georgia → Every provider in Austell → Allergy Physician nationwide →
The 8 allergy physician records with the nearest ZIP codes
- Haeja Jung, M.D.Johns Creek, GA 300971972871960
- Ariana Buchanan, MDCarrollton, GA 301171922026525
- Anu Mongia, MDCartersville, GA 301211659332922
- Nancy BonnerMarietta, GA 300671003369083
- Tricia Lee, MDDecatur, GA 300301841432457
- Thomas Chacko, MDAlpharetta, GA 300221356443089
- Sofia Edwards-Salmon, MDAlpharetta, GA 300221053817536
- Kasey Lanier, MDAlpharetta, GA 300221235636424
Common questions
What is John Michael Halwig, MD's NPI number?
John Michael Halwig, MD's National Provider Identifier (NPI) is 1841230760, issued on Jun 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Michael Halwig, MD located?
The NPPES record lists a practice address at 1620 Mulkey RD, Austell, GA, 30106. Phone: (770) 953-3331. Providers update this record themselves, so call before visiting.
How can I verify John Michael Halwig, MD's license?
NPPES lists Georgia license number 27558, as entered by the provider. Search the Georgia Composite Medical Board at https://medicalboard.georgia.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Michael Halwig, MD prescribe under Medicare Part D?
In 2024, John Michael Halwig, MD had 30 Medicare Part D claims; the average among allergy physician prescribers was 750. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.