MARK S DYKEWICZ MD
NPI 1518971092
Internal Medicine - Allergy & Immunology in Saint Louis, MO
About Mark S Dykewicz Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK S DYKEWICZ MD (NPI 1518971092) is an individual allergy & immunology provider in Saint Louis, Missouri, licensed in Missouri (R3N72) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with Ssm Health Saint Louis University Hospital, and is a graduate of Saint Louis University School Of Medicine (1981).
NPPES Registry Identity
Specialties & Licenses
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
Mark S Dykewicz 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 Mark Dykewicz reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Saint Louis, MO 63104
- Reassigned Medicare billing, Missouri enrollment
- 1,294 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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Ssm Health Saint Louis University Hospital
Acute Care Hospitals · Saint Louis, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63110 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 13
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
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 Mark Dykewicz's NPI number?
The NPI number for Mark Dykewicz is 1518971092. It was assigned to this individual provider in the NPPES registry on July 28, 2006.
Where is Mark Dykewicz located?
Mark Dykewicz practices at 3691 Rutger St Suite 100, Saint Louis, MO 63110. The listed phone number is (314) 977-9050.
What is Mark Dykewicz's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Allergy & Immunology, with taxonomy code 207RA0201X.
Is Mark Dykewicz enrolled in Medicare?
Yes. Mark Dykewicz 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 Mark Dykewicz's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Dykewicz reassigns Medicare benefits to Ssm Health Care Group (Saint Louis, MO). 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 Mark Dykewicz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Dykewicz accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan and Ambetter of Oklahoma and 4 other insurers list Mark Dykewicz 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 Mark Dykewicz affiliated with any hospitals?
According to CMS data, Mark Dykewicz is affiliated with Ssm Health Saint Louis University Hospital.
When was this NPI record last updated?
The NPPES record for Mark Dykewicz was last updated on April 1, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.
# Mark S Dykewicz, MD · NPI 1518971092
Allergy & Immunology physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since July 28, 2006.
## Identity
- **NPI:** 1518971092 (Entity type: Individual)
- **Enumerated:** July 28, 2006
- **Primary specialty:** Internal Medicine - Allergy & Immunology · taxonomy 207RA0201X
- **State license:** R3N72 (Missouri)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 3691 RUTGER ST, SUITE 100, Saint Louis, MO 63110-2515
- **Phone:** (314) 977-9050 · **Fax:** (314) 977-9770
## 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:** Ssm Health Care Group (NPI 1306589544, Saint Louis, MO), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Saint Louis University School Of Medicine, class of 1981
## Record status
- **NPPES last updated:** April 1, 2015
---
Source: [NPI Profile](https://npiprofile.com/npi/1518971092) · Data from the CMS NPPES public registry.