MELISSA N WEIS M.D.
NPI 1821242462
Internal Medicine - Pulmonary Disease in Saint Louis, MO
About Melissa N Weis M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MELISSA N WEIS M.D. (NPI 1821242462) is an individual pulmonary disease provider in Saint Louis, Missouri, licensed in Missouri (2011028712) and active in the NPI registry since November 2008. She is enrolled in Medicare PECOS, is affiliated with Adventhealth Deland, and is a graduate of Other (2008).
NPPES Registry Identity
Specialties & Licenses 3
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
Melissa N Weis M.d. 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
3Medicare enrollment records show Melissa Weis reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
St. Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- Medicare enrollment name: Critical Care Services PC
- 13 clinicians in this Medicare group
O Fallon, IL 62269
- Reassigned Medicare billing, Illinois enrollment
- 99 clinicians in this Medicare group
Pana, IL 62557
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Hshs Medical Group Inc
- 317 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 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Adventhealth Deland
Acute Care Hospitals · Deland, FLAdventhealth Gordon
Acute Care Hospitals · Calhoun, GAHshs St Elizabeth's Hospital
Acute Care Hospitals · O Fallon, ILAnmed Health
Acute Care Hospitals · Anderson, SCPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63128 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 4
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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAINT LOUIS, MO 63128
SAINT LOUIS, MO 63128
SAINT LOUIS, MO 63128
SAINT LOUIS, MO 63128
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 Melissa Weis's NPI number?
The NPI number for Melissa Weis is 1821242462. It was assigned to this individual provider in the NPPES registry on November 10, 2008.
Where is Melissa Weis located?
Melissa Weis practices at 12700 Southfork Rd, Saint Louis, MO 63128. The listed phone number is (314) 892-6565.
What is Melissa Weis's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Pulmonary Disease, with taxonomy code 207RP1001X.
Is Melissa Weis enrolled in Medicare?
Yes. Melissa Weis 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 Melissa Weis's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Melissa Weis reassigns Medicare benefits to 3 organizations: Critical Care Services, P.C. (St. Louis, MO), Cep America Illinois Intensivists (O Fallon, IL) and Sjl Health Systems Inc (Pana, IL). 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 Melissa Weis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Melissa Weis accept?
Health plans from Medica list Melissa Weis 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 Melissa Weis affiliated with any hospitals?
According to CMS data, Melissa Weis is affiliated with Adventhealth Deland, Adventhealth Gordon, Hshs St Elizabeth's Hospital and Anmed Health.
When was this NPI record last updated?
The NPPES record for Melissa Weis was last updated on March 14, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.
# Melissa N Weis, M.D. · NPI 1821242462
Pulmonary Disease physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since November 10, 2008.
## Identity
- **NPI:** 1821242462 (Entity type: Individual)
- **Enumerated:** November 10, 2008
- **Primary specialty:** Internal Medicine - Pulmonary Disease · taxonomy 207RP1001X
- **State license:** 2011028712 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 12700 SOUTHFORK RD, Saint Louis, MO 63128-3201
- **Phone:** (314) 892-6565 · **Fax:** (314) 892-4828
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Critical Care Services, P.C. (NPI 1942256250, St. Louis, MO); Cep America Illinois Intensivists (NPI 1992204184, O Fallon, IL); Sjl Health Systems Inc (NPI 1215037353, Pana, IL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2008
## Record status
- **NPPES last updated:** March 14, 2017
---
Source: [NPI Profile](https://npiprofile.com/npi/1821242462) · Data from the CMS NPPES public registry.