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KRISTA NICOLE GRENNAN MD
NPI 1093418428
Internal Medicine in Jacksonville, FL

Active since March 24, 2023PECOS Enrolled
4500 SAN PABLO RD S, JACKSONVILLE, FL 32224(904) 953-2000 Get Directions Write a Review

NPPES record last updated: June 12, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Jul 6, 2023, Mar 24, 2023 (2 updates tracked since 2023).

About Krista Nicole Grennan Md NPPES

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

KRISTA NICOLE GRENNAN MD (NPI 1093418428) is an individual internal medicine provider in Jacksonville, Florida, licensed in Florida (ME170196) and active in the NPI registry since March 2023. She is enrolled in Medicare PECOS, is affiliated with Mayo Clinic, and is a graduate of Univ Of Central Florida, College Of Medicine (2023).

NPPES Registry Identity

NPI1093418428
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameKRISTA NICOLE GRENNANCredential: MD
Location Address4500 SAN PABLO RD SJacksonville, FL 32224-1865
Mailing Address4500 San Pablo Rd SJacksonville, FL 32224-1865
Phone(904) 953-2000
Sole ProprietorNo
Medical School CMSUniv Of Central Florida, College Of MedicineGraduated 2023
Enumeration DateMarch 24, 2023
Last NPPES UpdateJune 12, 20262 updates tracked since enumeration
NPPES CertifiedJune 12, 2026
✔ NPI 1093418428 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in FL · ME170196
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.
4500 SAN PABLO RD S, Jacksonville, FL 32224
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Florida Blue (BlueCross BlueShield FL), Sanford Health Plan.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Krista Nicole Grennan Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID4385003649
PECOS Enrollment IDI20260714001510
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 Krista Grennan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

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

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

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Mayo Clinic

Acute Care Hospitals · Jacksonville, FL
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number100151
Location4500 San Pablo RdJacksonville, FL 32224 · Duval County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 32224 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
$130.04 typical visit price
range $56.00 – $171.84
Typical copayment $32.51 (range $14.00 – $42.96)
Most-billed visit code 99204
Established Patient
$99.16 typical visit price
range $17.57 – $139.16
Typical copayment $24.79 (range $4.39 – $34.79)
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.

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 Krista Grennan's NPI number?

The NPI number for Krista Grennan is 1093418428. It was assigned to this individual provider in the NPPES registry on March 24, 2023.

Where is Krista Grennan located?

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

What is Krista Grennan's specialty?

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

Is Krista Grennan enrolled in Medicare?

Yes. Krista Grennan is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Krista Grennan's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Krista Grennan reassigns Medicare benefits to Mayo Clinic Jacksonville (Jacksonville, FL). 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 Krista Grennan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Krista Grennan accept?

Health plans from Florida Blue (BlueCross BlueShield FL) and Sanford Health Plan list Krista Grennan 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 Krista Grennan affiliated with any hospitals?

According to CMS data, Krista Grennan is affiliated with Mayo Clinic.

When was this NPI record last updated?

The NPPES record for Krista Grennan was last updated on June 12, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.