GREG MARCO MD
NPI 1427098433
Internal Medicine - Critical Care Medicine in Grand Rapids, MI
About Greg Marco Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GREG MARCO MD (NPI 1427098433) is an individual critical care medicine provider in Grand Rapids, Michigan, licensed in Michigan (4301080028) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with Spectrum Health, and is a graduate of University Of Iowa, Rj & L Carver College Of Medicine (1996).
NPPES Registry Identity
Specialties & Licenses 2
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
Greg Marco 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 Reassignment
Medicare enrollment records show Greg Marco reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Grand Rapids, MI 49503
- Reassigned Medicare billing, Michigan enrollment
- 2,446 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
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Spectrum Health
Acute Care Hospitals · Grand Rapids, MIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 49503 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.
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.
GRAND RAPIDS, MI 49503
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 Greg Marco's NPI number?
The NPI number for Greg Marco is 1427098433. It was assigned to this individual provider in the NPPES registry on June 7, 2006.
Where is Greg Marco located?
Greg Marco practices at 100 Michigan St NE Suite 8861, Grand Rapids, MI 49503. The listed phone number is (616) 391-2802.
What is Greg Marco's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Greg Marco enrolled in Medicare?
Yes. Greg Marco 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 Greg Marco's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Greg Marco reassigns Medicare benefits to Spectrum Health Primary Care Partners (Grand Rapids, MI). 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 Greg Marco's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Greg Marco accept?
Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, Blue Care Network of Michigan and Blue Cross Blue Shield of Michigan Mutual Insurance Company and 1 other insurer list Greg Marco 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 Greg Marco affiliated with any hospitals?
According to CMS data, Greg Marco is affiliated with Spectrum Health.
When was this NPI record last updated?
The NPPES record for Greg Marco was last updated on February 26, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Greg Marco, MD · NPI 1427098433
Critical Care Medicine physician in Grand Rapids, Michigan. Individual provider, active in the CMS NPPES registry since June 7, 2006.
## Identity
- **NPI:** 1427098433 (Entity type: Individual)
- **Enumerated:** June 7, 2006
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** 4301080028 (Michigan)
- **Sole proprietor:** No
## Practice location
- **Address:** 100 MICHIGAN ST NE, SUITE 8861, Grand Rapids, MI 49503-2560
- **Phone:** (616) 391-2802 · **Fax:** (616) 391-0801
## 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:** Spectrum Health Primary Care Partners (NPI 1790093763, Grand Rapids, MI), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Iowa, Rj & L Carver College Of Medicine, class of 1996
## Record status
- **NPPES last updated:** February 26, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1427098433) · Data from the CMS NPPES public registry.