IAN M GREENBERG MD
NPI 1649791542
Internal Medicine - Gastroenterology in Dallas, TX
About Ian M Greenberg Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
IAN M GREENBERG MD (NPI 1649791542) is an individual gastroenterology provider in Dallas, Texas, licensed in Texas (BP10069838) and active in the NPI registry since June 2017. He is enrolled in Medicare PECOS, is affiliated with St Lukes Magic Valley Medical Center, and maintains a secondary practice location in Twin Falls.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 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
Ian M Greenberg Md 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 Reassignments
4Medicare enrollment records show Ian Greenberg reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Dallas, TX 75230
- Reassigned Medicare billing, Texas enrollment
- 70 clinicians in this Medicare group
Midland, MI 48670
- Reassigned Medicare billing, Michigan enrollment
- 536 clinicians in this Medicare group
Saginaw, MI 48601
- Reassigned Medicare billing, Michigan enrollment
- 12 clinicians in this Medicare group
Twin Falls, ID 83301
- Reassigned Medicare billing, Idaho enrollment
- Medicare enrollment name: St Lukes Clinic LLC
- 322 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 2
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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
St Lukes Magic Valley Medical Center
Acute Care Hospitals · Twin Falls, IDMedical City Arlington
Acute Care Hospitals · Arlington, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 75208 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
DALLAS, TX 75208
DALLAS, TX 75208
DALLAS, TX 75208
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 Ian Greenberg's NPI number?
The NPI number for Ian Greenberg is 1649791542. It was assigned to this individual provider in the NPPES registry on June 29, 2017.
Where is Ian Greenberg located?
Ian Greenberg practices at 122 W Colorado Blvd, Dallas, TX 75208. The listed phone number is (214) 947-6700.
What is Ian Greenberg's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Ian Greenberg enrolled in Medicare?
Yes. Ian Greenberg 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 organizations bill Medicare for Ian Greenberg's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ian Greenberg reassigns Medicare benefits to 4 organizations: Dallas Medical Specialists, PLLC (Dallas, TX), Mymichigan Medical Center Midland (Midland, MI), Mymichigan Medical Center Saginaw (Saginaw, MI) and St Luke's Clinic LLC (Twin Falls, ID). Each 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 Ian Greenberg's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ian Greenberg accept?
Health plans from Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 4 other insurers list Ian Greenberg 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 Ian Greenberg affiliated with any hospitals?
According to CMS data, Ian Greenberg is affiliated with St Lukes Magic Valley Medical Center and Medical City Arlington.
When was this NPI record last updated?
The NPPES record for Ian Greenberg was last updated on October 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 days 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.
# Ian M Greenberg, MD · NPI 1649791542
Gastroenterology physician in Dallas, Texas. Individual provider, active in the CMS NPPES registry since June 29, 2017.
## Identity
- **NPI:** 1649791542 (Entity type: Individual)
- **Enumerated:** June 29, 2017
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** BP10069838 (Texas)
- **Sole proprietor:** No
## Practice location
- **Address:** 122 W COLORADO BLVD, Dallas, TX 75208-2382
- **Phone:** (214) 947-6700
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Dallas Medical Specialists, PLLC (NPI 1508217811, Dallas, TX); Mymichigan Medical Center Midland (NPI 1205889490, Midland, MI); Mymichigan Medical Center Saginaw (NPI 1144886896, Saginaw, MI); St Luke's Clinic LLC (NPI 1790718229, Twin Falls, ID) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Missouri, Kansas City, School Of Medicine, class of 2017
## Record status
- **NPPES last updated:** October 22, 2026
---
Source: [NPI Profile](https://npiprofile.com/npi/1649791542) · Data from the CMS NPPES public registry.