Quick answers
- Does Margaret H. Sigman accept Medicare assignment?
- Yes. Medicare's clinician data says Margaret H. Sigman accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Margaret H. Sigman see?
- In 2024, CMS data shows 157 Original Medicare patients and 6,490 services for Margaret H. Sigman. This counts Original Medicare only and measures volume, not quality.
- What is Margaret H. Sigman's NPI number?
- 1447461108. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Margaret H. Sigman, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 157 |
|---|---|
| Services billed to Medicare | 6,490 |
| Different services or procedures | 10 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Professional service for preparation and provision of 1 or more antigens (95165)3,496 services
- Test for allergy using allergenic extract (95004)2,208 services
- Test for allergy using allergenic extract injected into skin (95024)435 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)141 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)122 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure63%
- Arthritis46%
- Asthma34%
- Anxiety30%
- Diabetes26%
Practice locations
Addresses where Margaret H. Sigman is enrolled with Medicare (CMS data updated October 2, 2026).
- 5924 Harbour Park DrMidlothian, VA 23112 (804) 739‑9005
Group practices
Medicare enrollment lists Margaret H. Sigman as a member of this group (CMS data updated October 2, 2026).
- Advanced Allergy and Asthma of Virginia2 clinicians in the group
Specialties
- Allergy/Immunologyprimary
Other allergist and immunologists in Virginia
Clinicians with the same Medicare primary specialty in Virginia — not a recommendation.
Other clinicians in Advanced Allergy and Asthma of Virginia
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2003 (23 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1447461108 |
| Corrections | Report 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
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians