DR. NICHOLAS WILLIAM KARLOW MD
NPI 1922669167
Emergency Medicine in Saint Louis, MO
About Dr. Nicholas William Karlow Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. NICHOLAS WILLIAM KARLOW MD (NPI 1922669167) is an individual emergency medicine provider in Saint Louis, Missouri, licensed in Missouri (2022044117) and active in the NPI registry since June 2019. He is enrolled in Medicare PECOS, is affiliated with St Lukes Hospital, and is a graduate of Other (2019).
NPPES Registry Identity
Specialties & Licenses
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. Nicholas William Karlow 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
8Medicare enrollment records show Nicholas Karlow reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Chesterfield, MO 63017
- Reassigned Medicare billing, Missouri enrollment
- Medicare enrollment name: Emergency Physicians Of St Lukes LLC
- 124 clinicians in this Medicare group
Festus, MO 63028
- Reassigned Medicare billing, Missouri enrollment
- 118 clinicians in this Medicare group
Saint Louis, MO 63128
- Reassigned Medicare billing, Missouri enrollment
- 186 clinicians in this Medicare group
Saint Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 241 clinicians in this Medicare group
Washington, MO 63090
- Reassigned Medicare billing, Missouri enrollment
- 178 clinicians in this Medicare group
Chesterfield, MO 63017
- Reassigned Medicare billing, Missouri enrollment
- 215 clinicians in this Medicare group
Alton, IL 62002
- Reassigned Medicare billing, Missouri enrollment
- 343 clinicians in this Medicare group
Saint Louis, MO 63136
- Reassigned Medicare billing, Missouri enrollment
- 114 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 3
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 Hospital
Acute Care Hospitals · Chesterfield, MOChristian Hospital Northeast
Acute Care Hospitals · Saint Louis, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63136 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.
SAINT LOUIS, MO 63136
SAINT LOUIS, MO 63136
SAINT LOUIS, MO 63136
SAINT LOUIS, MO 63136
SAINT LOUIS, MO 63136
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 Nicholas Karlow's NPI number?
The NPI number for Nicholas Karlow is 1922669167. It was assigned to this individual provider in the NPPES registry on June 27, 2019.
Where is Nicholas Karlow located?
Nicholas Karlow practices at 11133 Dunn Rd Dept Emergency Med, Saint Louis, MO 63136. The listed phone number is (314) 362-9123.
What is Nicholas Karlow's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Nicholas Karlow enrolled in Medicare?
Yes. Nicholas Karlow 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 Nicholas Karlow's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nicholas Karlow reassigns Medicare benefits to 8 organizations: Emergency Physicians Of St. Luke's, LLC (Chesterfield, MO), Mercy Hospital Jefferson (Festus, MO), Mercy Hospital South (Saint Louis, MO), Mercy Hospitals East Communities (Saint Louis, MO), Mercy Hospitals East Communities (Washington, MO) and 3 more organizations, listed in the Medicare section above. 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 Nicholas Karlow's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Nicholas Karlow accept?
Health plans from Oscar Insurance Company list Nicholas Karlow 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 Nicholas Karlow affiliated with any hospitals?
According to CMS data, Nicholas Karlow is affiliated with St Lukes Hospital and Christian Hospital Northeast.
When was this NPI record last updated?
The NPPES record for Nicholas Karlow was last updated on September 9, 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.
# Dr. Nicholas William Karlow, MD · NPI 1922669167
Emergency Medicine physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since June 27, 2019.
## Identity
- **NPI:** 1922669167 (Entity type: Individual)
- **Enumerated:** June 27, 2019
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 2022044117 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 11133 DUNN RD, DEPT EMERGENCY MED, Saint Louis, MO 63136-6163
- **Phone:** (314) 362-9123 · **Fax:** (314) 747-9160
## 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:** 8 organizations under Medicare reassignment (form CMS-855R): Emergency Physicians Of St. Luke's, LLC (NPI 1215359815, Chesterfield, MO); Mercy Hospital Jefferson (NPI 1508859661, Festus, MO); Mercy Hospital South (NPI 1568481984, Saint Louis, MO); Mercy Hospitals East Communities (NPI 1255790762, Saint Louis, MO); Mercy Hospitals East Communities (NPI 1104912997, Washington, MO); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2019
## Record status
- **NPPES last updated:** September 9, 2025
- **Other identifiers:** Medicaid 200071816 (MO)
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Source: [NPI Profile](https://npiprofile.com/npi/1922669167) · Data from the CMS NPPES public registry.