MARGARET HOLLISTER SIGMAN
NPI 1447461108
Allergy & Immunology in Midlothian, VA
About Margaret Hollister Sigman NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARGARET HOLLISTER SIGMAN (NPI 1447461108) is an individual allergy & immunology provider in Midlothian, Virginia, licensed in Virginia (0101253799) and active in the NPI registry since May 2007. She is enrolled in Medicare PECOS and is a graduate of Other (2003).
NPPES Registry Identity
Specialties & Licenses 3
Other Identifiers 5
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Margaret Hollister Sigman is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Margaret Sigman reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Midlothian, VA 23112
- Reassigned Medicare billing, Virginia enrollment
- 2 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 8
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Other Providers at the Same Location NPPES 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MIDLOTHIAN, VA 23112
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Margaret Sigman's NPI number?
The NPI number for Margaret Sigman is 1447461108. It was assigned to this individual provider in the NPPES registry on May 24, 2007.
Where is Margaret Sigman located?
Margaret Sigman practices at 5924 Harbour Park Dr, Midlothian, VA 23112. The listed phone number is (804) 739-9005.
What is Margaret Sigman's specialty?
The primary specialty registered for this NPI is Allergy & Immunology with taxonomy code 207K00000X.
Is Margaret Sigman enrolled in Medicare?
Yes. Margaret Sigman is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Margaret Sigman's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Sigman reassigns Medicare benefits to Advanced Allergy And Asthma Of Virginia (Midlothian, VA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Margaret Sigman's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Margaret Sigman accept?
Health plans from Oscar Health list Margaret Sigman as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Margaret Sigman was last updated on March 10, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Margaret Hollister Sigman · NPI 1447461108
Allergy & Immunology physician in Midlothian, Virginia. Individual provider, active in the CMS NPPES registry since May 24, 2007.
## Identity
- **NPI:** 1447461108 (Entity type: Individual)
- **Enumerated:** May 24, 2007
- **Primary specialty:** Allergy & Immunology · taxonomy 207K00000X
- **State license:** 0101253799 (Virginia)
- **Sole proprietor:** No
## Practice location
- **Address:** 5924 HARBOUR PARK DR, Midlothian, VA 23112-2163
- **Phone:** (804) 739-9005 · **Fax:** (804) 739-9006
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Advanced Allergy And Asthma Of Virginia (NPI 1104157114, Midlothian, VA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2003
## Record status
- **NPPES last updated:** March 10, 2017
- **Other identifiers:** Medicare PIN VVB136A (VA); Medicare PIN 2073555A (NC); Medicare PIN 2073555 (NC); and 2 more
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Source: [NPI Profile](https://npiprofile.com/npi/1447461108) · Data from the CMS NPPES public registry.