Esi Mail Pharmacy Service Inc
NPI 1558443911 · Mail Order Pharmacy · St. Louis, MO
Enrolled with Medicare as Part B Supplier - Pharmacy · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Esi Mail Pharmacy Service Inc is a Mail Order Pharmacy organization in St. Louis, MO (NPI 1558443911).
Provider details
- NPI number
- 1558443911
- Entity type
- Organization
- Primary specialty
- Mail Order PharmacySuppliers
- Organization subpart
- No
- Authorized official
- Susan Peppers, Asst Secretary(513) 858-4916
- License
- 2000148285 (MO)
Specialties & taxonomies
Suppliers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Other names (DBA / former)
- Doing business as
- Express Scripts
- Doing business as
- Express Scripts
Registry dates
- Enumerated
- 2006-10-19
- Last updated
- 2025-12-05
- Certified
- 2025-12-05
Frequently asked questions
- What is Esi Mail Pharmacy Service Inc's NPI number?
- Esi Mail Pharmacy Service Inc's National Provider Identifier (NPI) is 1558443911, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Esi Mail Pharmacy Service Inc?
- Esi Mail Pharmacy Service Inc is classified in the NPPES registry as Mail Order Pharmacy (Suppliers).
- Where is Esi Mail Pharmacy Service Inc located?
- Esi Mail Pharmacy Service Inc's practice location on file with NPPES is 4600 North Hanley Road, St. Louis, MO 63134-2715.
- What is Esi Mail Pharmacy Service Inc's phone number?
- The practice phone number listed in the NPPES registry for Esi Mail Pharmacy Service Inc is (800) 451-6245.
- Does Esi Mail Pharmacy Service Inc accept Medicare?
- Esi Mail Pharmacy Service Inc is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Esi Mail Pharmacy Service Inc?
- The authorized official listed on Esi Mail Pharmacy Service Inc's NPPES record is Susan Peppers, Asst Secretary. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Esi Mail Pharmacy Service Inc's NPI active?
- Yes — Esi Mail Pharmacy Service Inc's NPI (1558443911) is active in the NPPES registry as of the last update on 2025-12-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.