1. Home
  2. Directory
  3. Missouri
  4. O Fallon
  5. Nurse Practitioner
  6. NPI Profile

ALLYSE MARIE ORTEGA FNP-C, AGACNP, RN
NPI 1982149878
Nurse Practitioner - Family in O Fallon, MO

Active since December 30, 2016PECOS EnrolledAccepts Medicare Assignment
844 WATERBURY FALLS DR STE B, O FALLON, MO 63368(636) 385-5556(636) 614-2093 Get Directions Write a Review

NPPES record last updated: January 27, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jan 27, 2026, Jul 28, 2023, May 4, 2023 and 3 more (6 updates tracked since 2016).

About Allyse Marie Ortega Fnp-c, Agacnp, Rn NPPES

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

ALLYSE MARIE ORTEGA FNP-C, AGACNP, RN (NPI 1982149878) is an individual family provider in O Fallon, Missouri, licensed in Missouri (2017001487) and active in the NPI registry since December 2016. She is enrolled in Medicare PECOS, maintains 3 additional practice locations, and is a graduate of Other (2021).

NPPES Registry Identity

NPI1982149878
Entity TypeIndividualFemale
Primary Taxonomy363LF0000X
Provider Legal NameALLYSE MARIE ORTEGACredential: FNP-C, AGACNP, RN
Location Address844 WATERBURY FALLS DR STE BO Fallon, MO 63368-2208
Mailing Address844 Waterbury Falls Dr Ste BO Fallon, MO 63368-2208 · (636) 385-5556 · Fax (636) 614-2093
Phone(636) 385-5556
Fax(636) 614-2093
Sole ProprietorNo
Medical School CMSOtherGraduated 2021
Enumeration DateDecember 30, 2016
Last NPPES UpdateJanuary 27, 20266 updates tracked since enumeration
NPPES CertifiedJanuary 27, 2026
✔ NPI 1982149878 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyNurse Practitioner · FamilyPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LF0000X
License✔ Licensed in MO · 2017001487
Also ListedRegistered Nurse · EmergencyTaxonomy 163WE0003X · License 2010020396 (MO)
Also ListedNurse Practitioner · Acute CareTaxonomy 363LA2100X · License 2023000801 (MO)
844 WATERBURY FALLS DR STE B, O Fallon, MO 63368
Open in Google Maps ↗

Secondary Practice Locations 3

Location 19556 Manchester RdSaint Louis, MO 63119-1313 · Phone (314) 373-5740
Location 217 Clarkson RdEllisville, MO 63011-2215 · Phone (636) 552-9079
Location 327 The Boulevard Saint LouisRichmond Heights, MO 63117-1118 · Phone (636) 385-5556 · Fax (636) 614-2093

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan, Ambetter Health 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

Allyse Marie Ortega Fnp-c, Agacnp, Rn 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 ID4486930732
PECOS Enrollment IDI20170420002571
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

6

Medicare enrollment records show Allyse Ortega reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Complete Infusion Solutions LLC
Same address
Internal Medicine
844 WATERBURY FALLS DR STE B
O Fallon, MO 63368
  • Reassigned Medicare billing, Missouri enrollment
  • 2 clinicians in this Medicare group
NPI 1386372514 (800) 958-4042
Cep America LLC
7.0 mi
Emergency Medicine
100 MEDICAL PLZ
Lake St Louis, MO 63367
  • Reassigned Medicare billing, Missouri enrollment
  • 269 clinicians in this Medicare group
NPI 1982259305 (636) 625-5200
Mercy East Ambulatory Services LLC
8.9 mi
Urgent Care
1722 CLARKSON RD
Chesterfield, MO 63017
  • Reassigned Medicare billing, Missouri enrollment
  • 169 clinicians in this Medicare group
NPI 1134673148 (636) 206-2665
Total Access Urgent Care, PC
20 mi
Urgent Care
9556 MANCHESTER RD
Saint Louis, MO 63119
  • Reassigned Medicare billing, Missouri enrollment
  • 111 clinicians in this Medicare group
NPI 1962684886 (314) 961-2255
South St Louis Medical Associates LLC
23 mi
Internal Medicine
3824 WATSON RD
Saint Louis, MO 63109
  • Reassigned Medicare billing, Missouri enrollment
  • 6 clinicians in this Medicare group
NPI 1750681151 (314) 881-0300
Tauc Il, PC
39 mi
Urgent Care
400 BELTLINE RD
Collinsville, IL 62234
  • Reassigned Medicare billing, Illinois enrollment
  • 28 clinicians in this Medicare group
NPI 1487401709 (618) 215-5703

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 10

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.

Injection, inclisiran, 1 mg J1306
Inclisiran is an injection administered to lower cholesterol levels. It works by blocking the production of LDL (bad cholesterol) in your liver. This medicine is often used when diet changes and other medications have not been effective.
10,508 services27 patients
Injection, denosumab, 1 mg J0897
Denosumab is a medication given via injection to strengthen your bones. It works by slowing down the cells that break down bone, improving bone density and reducing the risk of fractures. It's often used for osteoporosis treatment.
2,880 services29 patients
Administration of non-hormonal anti-neoplastic chemotherapy under skin or into muscle 96401
This procedure involves giving anti-cancer drugs, which don't contain hormones, into the muscle or under the skin. These drugs help to stop the growth of cancer cells. The process is usually quick and done by a healthcare professional.
167 services48 patients
Administration of chemotherapy into vein, 1 hour or less 96413
Chemotherapy is a treatment that uses drugs to destroy cancer cells. When administered into a vein, it's often through an IV. This procedure usually lasts 1 hour or less. You may feel a slight pinch as the needle is inserted, but it's generally painless.
124 services24 patients
Injection of drug or substance under skin or into muscle 96372
This procedure involves administering medication directly under the skin or into a muscle. A small needle is used to inject the drug, allowing it to be absorbed quickly into the bloodstream. It's a common method for delivering a variety of medications.
118 services48 patients
Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less 96365
This is a procedure where a medical professional inserts a small tube into your vein to deliver medication, nutrients, or fluids directly into your bloodstream. This can be for treatment, prevention, or diagnosis. The process typically takes less than an hour.
76 services19 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63368 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
$86.32 typical visit price
range $55.65 – $169.38
Typical copayment $21.58 (range $13.91 – $42.34)
Most-billed visit code 99203
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

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

COMPLETE INFUSION SOLUTIONS LLC
Internal Medicine
844 WATERBURY FALLS DR STE B
O FALLON, MO 63368
St. Charles County (800) 958-4042

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 Allyse Ortega's NPI number?

The NPI number for Allyse Ortega is 1982149878. It was assigned to this individual provider in the NPPES registry on December 30, 2016.

Where is Allyse Ortega located?

Allyse Ortega practices at 844 Waterbury Falls Dr Ste B, O Fallon, MO 63368. The listed phone number is (636) 385-5556.

What is Allyse Ortega's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

Is Allyse Ortega enrolled in Medicare?

Yes. Allyse Ortega 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 Allyse Ortega's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Allyse Ortega reassigns Medicare benefits to 6 organizations: Complete Infusion Solutions LLC (O Fallon, MO), Cep America LLC (Lake St Louis, MO), Mercy East Ambulatory Services LLC (Chesterfield, MO), Total Access Urgent Care, PC (Saint Louis, MO), South St Louis Medical Associates LLC (Saint Louis, MO) and 1 more organization, listed in the Medicare section above. 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 Allyse Ortega's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Allyse Ortega accept?

Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan and Ambetter of Oklahoma and 2 other insurers list Allyse Ortega 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 Allyse Ortega was last updated on January 27, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.