DR. MICHAEL GRUNDEL ISON M.D., M.S.
NPI 1316941222
Internal Medicine - Infectious Disease in Falls Church, VA
About Dr. Michael Grundel Ison M.d., M.s. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MICHAEL GRUNDEL ISON M.D., M.S. (NPI 1316941222) is an individual infectious disease provider in Falls Church, Virginia, licensed in Virginia (0101230684) and active in the NPI registry since June 2005. He is enrolled in Medicare PECOS, is affiliated with Methodist Medical Center Of Illinois, and maintains a secondary practice location in Derwood.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 1
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
Dr. Michael Grundel Ison M.d., M.s. 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 Michael Ison reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Falls Church, VA 22042
- Reassigned Medicare billing, District of Columbia enrollment
- 2,618 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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Methodist Medical Center Of Illinois
Acute Care Hospitals · Peoria, ILInova Fairfax Hospital
Acute Care Hospitals · Falls Church, VAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 22042 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Referred Medical Equipment & Supplies CMS DME claims 3
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
FALLS CHURCH, VA 22042
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 Michael Ison's NPI number?
The NPI number for Michael Ison is 1316941222. It was assigned to this individual provider in the NPPES registry on June 8, 2005.
Where is Michael Ison located?
Michael Ison practices at 3300 Gallows Rd, Falls Church, VA 22042. The listed phone number is (703) 776-4001.
What is Michael Ison's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.
Is Michael Ison enrolled in Medicare?
Yes. Michael Ison 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 Michael Ison's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Michael Ison reassigns Medicare benefits to Inova Health Care Services (Falls Church, 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 Michael Ison's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Michael Ison accept?
Health plans from Oscar Health list Michael Ison 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.
Is Michael Ison affiliated with any hospitals?
According to CMS data, Michael Ison is affiliated with Methodist Medical Center Of Illinois and Inova Fairfax Hospital.
When was this NPI record last updated?
The NPPES record for Michael Ison was last updated on July 8, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Dr. Michael Grundel Ison, M.D., M.S. · NPI 1316941222
Infectious Disease physician in Falls Church, Virginia. Individual provider, active in the CMS NPPES registry since June 8, 2005.
## Identity
- **NPI:** 1316941222 (Entity type: Individual)
- **Enumerated:** June 8, 2005
- **Primary specialty:** Internal Medicine - Infectious Disease · taxonomy 207RI0200X
- **State license:** 0101230684 (Virginia)
- **Sole proprietor:** No
## Practice location
- **Address:** 3300 GALLOWS RD, Falls Church, VA 22042-3307
- **Phone:** (703) 776-4001 · **Fax:** (703) 776-7113
## 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:** Inova Health Care Services (NPI 1952320061, Falls Church, VA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of South Florida College Of Medicine, class of 1997
## Record status
- **NPPES last updated:** July 8, 2024
- **Other identifiers:** Medicaid 5862540 (VA)
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Source: [NPI Profile](https://npiprofile.com/npi/1316941222) · Data from the CMS NPPES public registry.