DR. SARAH JOYCE MERMELSTEIN MD
NPI 1962689398
Internal Medicine in Saint Louis, MO

Q: What is Sarah Mermelstein's NPI number?

The NPI number for Sarah Mermelstein is 1962689398. It was assigned to this individual provider in the NPPES registry on January 28, 2008.

Q: What is Sarah Mermelstein's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: When was this NPI record last updated?

The NPPES record for Sarah Mermelstein was last updated on December 8, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.

Active since January 28, 2008PECOS Enrolled

1 BROOKINGS DR, SAINT LOUIS, MO 63130(314) 935-6666(314) 696-1214 Get Directions Write a Review

NPPES record last updated: December 8, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Dec 8, 2025, Apr 25, 2024, Apr 10, 2024 and 7 more (10 updates tracked since 2015).

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About Dr. Sarah Joyce Mermelstein Md NPPES

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

DR. SARAH JOYCE MERMELSTEIN MD (NPI 1962689398) is an individual internal medicine provider in Saint Louis, Missouri, licensed in Missouri (2010015946) and active in the NPI registry since January 2008. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1962689398

Entity TypeIndividualFemale

Primary Taxonomy207R00000X

Provider Legal NameDR. SARAH JOYCE MERMELSTEINCredential: MD

Location Address1 BROOKINGS DRSaint Louis, MO 63130-4862

Mailing AddressPo Box 7412043Chicago, IL 60674-2043 · (314) 935-6666 · Fax (314) 696-1214

Phone(314) 935-6666

Fax(314) 696-1214

Sole ProprietorNo

Enumeration DateJanuary 28, 2008

Last NPPES UpdateDecember 8, 202510 updates tracked since enumeration

✔ NPI 1962689398 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in MO · 2010015946

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

1 BROOKINGS DR, Saint Louis, MO 63130

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Other Identifiers 1

Medicaid204208805MO

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include UnitedHealthcare.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Sarah Joyce Mermelstein Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Sarah Mermelstein reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Washington University

2.9 mi

Multi-Specialty

1 CHILDRENS PL
Saint Louis, MO 63110

Reassigned Medicare billing, Missouri enrollment
628 clinicians in this Medicare group

NPI 1194765685 (314) 286-1264

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63130 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$128.28 typical visit price

range $55.65 – $169.38

Typical copayment $32.07 (range $13.91 – $42.34)

Most-billed visit code 99204

Established Patient

$98.37 typical visit price

range $17.76 – $137.92

Typical copayment $24.59 (range $4.44 – $34.48)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

DR. STEPHANIE M HAMMER MD

Internal Medicine

1 BROOKINGS DR
SAINT LOUIS, MO 63130

St. Louis County (314) 935-6666

MS. JESSICA BECKMANN SCHENK LCSW

Counselor (Professional)

1 BROOKINGS DR
SAINT LOUIS, MO 63130

St. Louis County (314) 935-6666

WASHINGTON UNIVERSITY IN ST. LOUIS

Specialist/Technologist (Athletic Trainer)

1 BROOKINGS DR, CAMPUS BOX 1067
SAINT LOUIS, MO 63130

St. Louis County (314) 935-6461

MS. YUJIA LEI PHD

Psychologist

1 BROOKINGS DR
SAINT LOUIS, MO 63130

St. Louis County (314) 935-6666

REBECCA GLICK

Social Worker

1 BROOKINGS DR
SAINT LOUIS, MO 63130

St. Louis County (703) 309-4348

MRS. SHARI L CRUTCHFIELD WHNP

Nurse Practitioner

1 BROOKINGS DR
SAINT LOUIS, MO 63130

St. Louis County (314) 935-6666

JACKEE HILL ATC

Specialist/Technologist (Athletic Trainer)

1 BROOKINGS DR
SAINT LOUIS, MO 63130

St. Louis County (314) 935-7114

MRS. ALLISON MARIE KERTZ FNP

Nurse Practitioner (Family)

1 BROOKINGS DR
SAINT LOUIS, MO 63130

St. Louis County (314) 935-6649

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 Sarah Mermelstein's NPI number?

The NPI number for Sarah Mermelstein is 1962689398. It was assigned to this individual provider in the NPPES registry on January 28, 2008.

Where is Sarah Mermelstein located?

Sarah Mermelstein practices at 1 Brookings Dr, Saint Louis, MO 63130. The listed phone number is (314) 935-6666.

What is Sarah Mermelstein's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Sarah Mermelstein enrolled in Medicare?

Yes. Sarah Mermelstein is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Sarah Mermelstein's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Sarah Mermelstein reassigns Medicare benefits to Washington University (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 Sarah Mermelstein's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Sarah Mermelstein accept?

Health plans from UnitedHealthcare list Sarah Mermelstein 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.

When was this NPI record last updated?

The NPPES record for Sarah Mermelstein was last updated on December 8, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.