Margaret Chaffin Siman, M.D.
Family Medicine Physician · Staunton, VA
Margaret Chaffin Siman, M.D. is a family medicine physician with a practice address in Staunton, Virginia, and NPI 1225006729, issued on Mar 9, 2006. Check the license (Virginia 0101053670, as entered in NPPES) on the Virginia Department of Health Professions; the Medicare figures below come from public CMS files.
- Name
- Margaret Chaffin Siman
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 0101053670 VA
Self-reported in NPPES; status is on the state search - Practice location
- 42 Lambert St Ste 422, Staunton, VA 24401
- Phone
- (540) 213-0311
- Enumerated
- Mar 9, 2006
- Record last updated
- Feb 23, 2023
- Fax
- (540) 213-0122
- Medicare enrollment
- Enrolled (PECOS I20050906000493); accepts Medicare assignment
- Medical or professional school
- Eastern Virginia Medical School, 1994
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 4,137 in Virginia → Look up another NPI →
Verify Margaret Chaffin Siman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersVirginia Department of Health Professions
Search for license 0101053670Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Most of these Medicare Part D claims are vaccines, 55% of the cost of the top drugs
5,012 Medicare Part D claims for 680 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 23% of claims. 443 claims were for opioids.
Most prescribed
Pharmacies often give vaccines under a standing order that names one clinician, and CMS counts every such claim under that clinician's NPI. These claims are therefore not a measure of this clinician's own prescribing.
- Abrysvo293 claims
- Rosuvastatin Calcium193 claims
- Shingrix175 claims
- Amlodipine Besylate167 claims
- Oxycodone Hcl138 claims
- Levothyroxine Sodium106 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: $320.49
17 payments; by number, the most common kind was food and beverage; the largest payer was Pfizer Inc. The 55,478 providers of this specialty with any payment received $902.55 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
- Select Physical Therapy Holdings IncCharlottesville, VA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Margaret Chaffin Siman among 4,137 family medicine physician records in Virginia
Margaret Chaffin Siman, M.D. is one of 4,137 family medicine physician records with a practice address in Virginia. 74% 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 15% of them.
- NPI issued2006 · 15% of these records are older, 50% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1994 · median 2004 among the 2,426 with a school on file
- Record last updated2023 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Virginia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
19 family medicine physician records list a practice address in Staunton
They are 19 of the 596 NPPES records with a practice address in Staunton, and 4,137 family medicine physician records in Virginia.
All 4,137 in Virginia → Every provider in Staunton → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Octavio De Los Reyes, DOStaunton, VA 244011427028828
- Margaret Deel, M.D.Staunton, VA 244011124151360
- Vicki Dull, M.D.Staunton, VA 244011487799342
- Emily Edwards, DOStaunton, VA 244011366641011
- Benjamin Farley, MDStaunton, VA 244011275505802
- Nedira Haik, MDStaunton, VA 244011275593808
- Frank Johnson, MDStaunton, VA 244011851357370
- Leon Lenker, MDStaunton, VA 244011265402671
Common questions
What is Margaret Chaffin Siman, M.D.'s NPI number?
Margaret Chaffin Siman, M.D.'s National Provider Identifier (NPI) is 1225006729, issued on Mar 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Chaffin Siman, M.D. located?
The NPPES record lists a practice address at 42 Lambert St Ste 422, Staunton, VA, 24401. Phone: (540) 213-0311. Providers update this record themselves, so call before visiting.
How can I verify Margaret Chaffin Siman, M.D.'s license?
NPPES lists Virginia license number 0101053670, 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 Margaret Chaffin Siman, M.D. prescribe under Medicare Part D?
In 2024, Margaret Chaffin Siman, M.D. had 5,012 Medicare Part D claims for 680 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.