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DR. SHERIDAN NICOLE MARKATOS MD
NPI 1215595574
Anesthesiology in Grand Rapids, MI

Active since June 03, 2019PECOS EnrolledAccepts Medicare Assignment
100 MICHIGAN ST NE, GRAND RAPIDS, MI 49503(616) 267-0250 Get Directions Write a Review

NPPES record last updated: October 6, 2025. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Oct 6, 2025, Jun 20, 2024, Jun 3, 2019 (3 updates tracked since 2019).

About Dr. Sheridan Nicole Markatos Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. SHERIDAN NICOLE MARKATOS MD (NPI 1215595574) is an individual anesthesiology provider in Grand Rapids, Michigan, licensed in Michigan (4301511199) and active in the NPI registry since June 2019. She is enrolled in Medicare PECOS and is a graduate of Central Michigan College Of Medicine (2019).

NPPES Registry Identity

NPI1215595574
Entity TypeIndividualFemale
Primary Taxonomy207L00000X
Provider Legal NameDR. SHERIDAN NICOLE MARKATOSCredential: MD
Location Address100 MICHIGAN ST NEGrand Rapids, MI 49503-2560
Mailing Address100 Michigan St Ne # Mc845Grand Rapids, MI 49503-2560
Phone(616) 267-0250
Sole ProprietorNo
Medical School CMSCentral Michigan College Of MedicineGraduated 2019
Enumeration DateJune 3, 2019
Last NPPES UpdateOctober 6, 20253 updates tracked since enumeration
NPPES CertifiedOctober 6, 2025
✔ NPI 1215595574 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
License✔ Licensed in MI · 4301511199
Definition
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
Also ListedAnesthesiology · Pediatric AnesthesiologyTaxonomy 207LP3000X · License 4301511199 (MI)
100 MICHIGAN ST NE, Grand Rapids, MI 49503
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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. Sheridan Nicole Markatos 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.

PECOS PAC ID8123352994
PECOS Enrollment IDI20240723001569
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Sheridan Markatos reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Spectrum Health Primary Care Partners
0.1 mi
Hospitalist
100 MICHIGAN ST NE
Grand Rapids, MI 49503
  • Reassigned Medicare billing, Michigan enrollment
  • 2,446 clinicians in this Medicare group
NPI 1790093763 (616) 391-3139

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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.

MAUREEN TAN PEDRES M.D.
Internal Medicine
100 MICHIGAN ST NE, SUITE A721
GRAND RAPIDS, MI 49503
Kent County (616) 391-3139
MATTHEW H ARMSTRONG MD
Anesthesiology
100 MICHIGAN ST NE
GRAND RAPIDS, MI 49503
Kent County (616) 391-1510
ALINE DE QUADROS TEIXEIRA MD
Internal Medicine
100 MICHIGAN ST NE
GRAND RAPIDS, MI 49503
Kent County (616) 391-3139
DR. LINDSEY DANIELLE CONRADO PT, DPT
Physical Therapist
100 MICHIGAN ST NE
GRAND RAPIDS, MI 49503
Kent County (161) 639-1177
DANIEL H. ROBINSON D.O.
Anesthesiology
100 MICHIGAN ST NE
GRAND RAPIDS, MI 49503
Kent County (616) 391-1510
MARK GREENWOOD DO
Emergency Medicine
100 MICHIGAN ST NE, MC 71
GRAND RAPIDS, MI 49503
Kent County (616) 391-5310
RAYMOND SCUREK MD
Emergency Medicine
100 MICHIGAN ST NE
GRAND RAPIDS, MI 49503
Kent County (616) 391-1680
MRS. RACHEL LEIGH VANSTRIEN PA-C
Physician Assistant
100 MICHIGAN ST NE, SUITE 8861
GRAND RAPIDS, MI 49503
Kent County (616) 391-0800

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 Sheridan Markatos's NPI number?

The NPI number for Sheridan Markatos is 1215595574. It was assigned to this individual provider in the NPPES registry on June 3, 2019.

Where is Sheridan Markatos located?

Sheridan Markatos practices at 100 Michigan St NE, Grand Rapids, MI 49503. The listed phone number is (616) 267-0250.

What is Sheridan Markatos's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is Sheridan Markatos enrolled in Medicare?

Yes. Sheridan Markatos 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 Sheridan Markatos's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Sheridan Markatos 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 Sheridan Markatos's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Sheridan Markatos was last updated on October 6, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 months 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.