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NIKKI MESSER LCSW
NPI 1851909337
Social Worker in Jacksonville, FL

Active since July 21, 2020PECOS EnrolledAccepts Medicare Assignment
4500 SAN PABLO RD S, JACKSONVILLE, FL 32224(904) 953-2000 Get Directions Write a Review

NPPES record last updated: December 24, 2024. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Dec 24, 2024, Sep 9, 2020, Jul 21, 2020 (3 updates tracked since 2020).

About Nikki Messer Lcsw NPPES

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

NIKKI MESSER LCSW (NPI 1851909337) is an individual social worker in Jacksonville, Florida, licensed in Florida (SW22290) and active in the NPI registry since July 2020. She is enrolled in Medicare PECOS, maintains a secondary practice location in Jacksonville, and is a graduate of Other (2019).

NPPES Registry Identity

NPI1851909337
Entity TypeIndividualFemale
Primary Taxonomy104100000X
Provider Legal NameNIKKI MESSERCredential: LCSW
Location Address4500 SAN PABLO RD SJacksonville, FL 32224-1865
Mailing Address4500 San Pablo Rd SJacksonville, FL 32224-1865 · (904) 953-2000
Phone(904) 953-2000
Sole ProprietorNo
Medical School CMSOtherGraduated 2019
Enumeration DateJuly 21, 2020
Last NPPES UpdateDecember 24, 20243 updates tracked since enumeration
NPPES CertifiedDecember 24, 2024
✔ NPI 1851909337 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial WorkerBehavioral Health & Social Service Providers
Taxonomy Code104100000X
License✔ Licensed in FL · SW22290
Definition
A social worker is a person who is qualified by a Social Work degree, and licensed, certified or registered by the state as a social worker to practice within the scope of that license. A social worker provides assistance and counseling to clients and their families who are dealing with social, emotional and environmental problems. Social work services may be rendered to individuals, families, groups, and the public.
4500 SAN PABLO RD S, Jacksonville, FL 32224
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Secondary Practice Location 1

Location 110961 Burnt Mill Rd Apt 1021Jacksonville, FL 32256-4662 · Phone (717) 538-8744 · Fax (561) 404-4735

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Absolute Total Care, Ambetter Health, Ambetter of Alabama and more.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

Nikki Messer Lcsw 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.

PECOS PAC ID6507214459
PECOS Enrollment IDI20231203000130
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 Reassignments

2

Medicare enrollment records show Nikki Messer reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Mayo Clinic Jacksonville
Same address
Health Service
4500 SAN PABLO RD S
Jacksonville, FL 32224
  • Reassigned Medicare billing, Florida enrollment
  • 1,828 clinicians in this Medicare group
NPI 1174143986 (904) 953-2000
Raul J Rodriguez Mdpa
275 mi
Addiction Psychiatry
403 SE 1ST ST
Delray Beach, FL 33483
  • Reassigned Medicare billing, Florida enrollment
  • 37 clinicians in this Medicare group
NPI 1891067823 (561) 266-8866

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

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.

KATHERINE L WALSH PA-C/MPH
Physician Assistant
4500 SAN PABLO RD S
JACKSONVILLE, FL 32224
Duval County (904) 953-2000
DR. JAMI ANN ROTHE KINNUCAN M.D.
Internal Medicine (Gastroenterology)
4500 SAN PABLO RD S
JACKSONVILLE, FL 32224
Duval County (904) 953-2000
GLENN SHI MD
Orthopaedic Surgery
4500 SAN PABLO RD S
JACKSONVILLE, FL 32224
Duval County (904) 953-2000
MICHELLE TULANG MD
Internal Medicine
4500 SAN PABLO RD S
JACKSONVILLE, FL 32224
Duval County (904) 953-2000
RICARDO PAGAN MD
Hospitalist
4500 SAN PABLO RD S
JACKSONVILLE, FL 32224
Duval County (904) 953-2000
CRYSTAL LYNN CRNA
Nurse Anesthetist, Certified Registered
4500 SAN PABLO RD S
JACKSONVILLE, FL 32224
Duval County (904) 953-2000
LAUREN E FREED CRNA
Nurse Anesthetist, Certified Registered
4500 SAN PABLO RD S
JACKSONVILLE, FL 32224
Duval County (904) 953-2000
MRS. MELINA VOLNER SOMMESE PA-C
Physician Assistant
4500 SAN PABLO RD S
JACKSONVILLE, FL 32224
Duval County (904) 953-2594

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 Nikki Messer's NPI number?

The NPI number for Nikki Messer is 1851909337. It was assigned to this individual provider in the NPPES registry on July 21, 2020.

Where is Nikki Messer located?

Nikki Messer practices at 4500 San Pablo Rd S, Jacksonville, FL 32224. The listed phone number is (904) 953-2000.

What is Nikki Messer's specialty?

The primary specialty registered for this NPI is Social Worker with taxonomy code 104100000X.

Is Nikki Messer enrolled in Medicare?

Yes. Nikki Messer 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 Nikki Messer's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Nikki Messer reassigns Medicare benefits to 2 organizations: Mayo Clinic Jacksonville (Jacksonville, FL) and Raul J Rodriguez Mdpa (Delray Beach, FL). 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 Nikki Messer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Nikki Messer accept?

Health plans from Ambetter Health, Ambetter from Absolute Total Care, Ambetter of Alabama, Ambetter of North Carolina and Ambetter of Tennessee and 2 other insurers list Nikki Messer 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 Nikki Messer was last updated on December 24, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 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.