Jonathon Brian Posthumus, MD
Allergy & Immunology Physician · Fredericksburg, VA
Jonathon Brian Posthumus, MD is an allergy & immunology physician with a practice address in Fredericksburg, Virginia, and NPI 1255536553, issued on Jun 18, 2007. Check the license (Virginia 0101251294, as entered in NPPES) on the Virginia Department of Health Professions; the Medicare figures below come from public CMS files.
- Name
- Jonathon Brian Posthumus
- Credential
- MD
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License number
- 0101251294 VA
Self-reported in NPPES; status is on the state search - Practice location
- 511 Park Hill Dr, Fredericksburg, VA 22401
- Phone
- (540) 371-5660
- Enumerated
- Jun 18, 2007
- Record last updated
- Oct 31, 2023
- Fax
- (540) 372-6920
- Medicaid ID
- 1255536553 VA
- Medicare enrollment
- Enrolled (PECOS I20120917000376); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest allergy & immunology physician records → All 136 in Virginia → Look up another NPI →
Also registered at 511 Park Hill Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Irina Dawson, M.D.Allergy & Immunology Physician1992190946
- Sara Pulliam, FNP-CNurse Practitioner1518698604
- Alison Schaefer, N.P.Nurse Practitioner1932198553
- Peter Smith, M.D.Allergy & Immunology Physician1336139260
- Mark Wenger, M. D.Allergy & Immunology Physician1336139666
- Bonita Wilson, M. D.Allergy & Immunology Physician1891785127
Verify Jonathon Brian Posthumus in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersVirginia Department of Health Professions
Search for license 0101251294Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
38% more Medicare Part D claims than the average allergy & immunology physician in 2024
1,019 Medicare Part D claims for 178 beneficiaries, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D.
Most prescribed
- Montelukast Sodium111 claims
- Albuterol Sulfate Hfa91 claims
- Azelastine Hcl80 claims
- Prednisone57 claims
- Epinephrine54 claims
- Levocetirizine Dihydrochloride49 claims
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.
Industry payments in 2024: $1,329.80
63 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 2,496 providers of this specialty with any payment received $8,321.81 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Allergy Partners PLLCFredericksburg, VA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jonathon Brian Posthumus among 136 allergy & immunology physician records in Virginia
Jonathon Brian Posthumus, MD is one of 136 allergy & immunology physician records with a practice address in Virginia. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 53% of them.
- NPI issued2007 · 53% of these records are older, 35% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2007 · median 2002 among the 97 with a school on file
- Record last updated2023 · 43% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207K00000X and a Virginia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Allergy & Immunology Physician providers in Virginia
There are 136 allergy & immunology physician records in Virginia.
All 136 in Virginia → Every provider in Fredericksburg → Allergy & Immunology Physician nationwide →
The 8 allergy & immunology physician records with the nearest ZIP codes
- Ahmed Butt, M.D.Fredericksburg, VA 224011003027301
- Julie Cooper, M.D.Fredericksburg, VA 224011831486182
- Seth Craig, M.D.Fredericksburg, VA 224011558395152
- Irina Dawson, M.D.Fredericksburg, VA 224011992190946
- Andrew Kim, M.D.Fredericksburg, VA 224011053340463
- Jonathan Mozena, M.D.Fredericksburg, VA 224011093757163
- Peter Smith, M.D.Fredericksburg, VA 224011336139260
- Shahab Virani, M.D.Fredericksburg, VA 224011033470091
Common questions
What is Jonathon Brian Posthumus, MD's NPI number?
Jonathon Brian Posthumus, MD's National Provider Identifier (NPI) is 1255536553, issued on Jun 18, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Jonathon Brian Posthumus, MD located?
The NPPES record lists a practice address at 511 Park Hill Dr, Fredericksburg, VA, 22401. Phone: (540) 371-5660. Providers update this record themselves, so call before visiting.
How can I verify Jonathon Brian Posthumus, MD's license?
NPPES lists Virginia license number 0101251294, as entered by the provider. Search the Virginia Department of Health Professions at https://dhp.virginiainteractive.org/lookup/index. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Jonathon Brian Posthumus, MD prescribe under Medicare Part D?
In 2024, Jonathon Brian Posthumus, MD had 1,019 Medicare Part D claims for 178 beneficiaries; the average among allergy & immunology physician prescribers was 741. 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.