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MR. RALPH J DUDA JR. M.D.
NPI 1356436406
Internal Medicine - Endocrinology, Diabetes & Metabolism in Springfield, MO

Active since October 04, 2006PECOS Enrolled
909 E REPUBLIC RD STE D200, SPRINGFIELD, MO 65807(417) 883-7889(417) 890-6151 Get Directions Write a Review

NPPES record last updated: April 13, 2022. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Apr 13, 2022, Jul 28, 2021, Sep 16, 2016 (3 updates tracked since 2016).

About Mr. Ralph J Duda Jr. M.d. NPPES

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

MR. RALPH J DUDA JR. M.D. (NPI 1356436406) is an individual endocrinology, diabetes & metabolism provider in Springfield, Missouri, licensed in Missouri (R7G82) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1356436406
Entity TypeIndividualMale
Primary Taxonomy207RE0101X
Provider Legal NameMR. RALPH J DUDA JR.Credential: M.D.
Location Address909 E REPUBLIC RD STE D200Springfield, MO 65807-6012
Mailing Address909 E Republic Rd Ste D200Springfield, MO 65807-6012 · (417) 883-7889 · Fax (417) 890-6151
Phone(417) 883-7889
Fax(417) 890-6151
Sole ProprietorNo
Enumeration DateOctober 4, 2006
Last NPPES UpdateApril 13, 20223 updates tracked since enumeration
NPPES CertifiedApril 13, 2022
✔ NPI 1356436406 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
License✔ Licensed in MO · R7G82
Definition
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.
909 E REPUBLIC RD STE D200, Springfield, MO 65807
Open in Google Maps ↗

Other Identifiers 2

OtherP00266673Ptan
Other16610MO · Blue Cross Blue Shield

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mr. Ralph J Duda Jr. M.d. 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 Ralph Duda reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Ahs Oklahoma Heart LLC
162 mi
Specialist
9228 S MINGO RD, SUITE 200
Tulsa, OK 74133
  • Reassigned Medicare billing, Oklahoma enrollment
  • 151 clinicians in this Medicare group
NPI 1780857540 (918) 592-0999

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 65807 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
$121.96 typical visit price
range $52.28 – $161.24
Typical copayment $30.49 (range $13.07 – $40.31)
Most-billed visit code 99204
Established Patient
$93.24 typical visit price
range $16.30 – $131.05
Typical copayment $23.31 (range $4.07 – $32.76)
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 5

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

SARAH FARMER
Nurse Practitioner (Family)
909 E REPUBLIC RD STE D200
SPRINGFIELD, MO 65807
Greene County (417) 883-7889
CLINVEST RESEARCH LLC.
Clinic/Center (Research)
909 E REPUBLIC RD STE D200
SPRINGFIELD, MO 65807
Greene County (417) 883-7889
MRS. CAROL A MATTHEWS NP
Registered Nurse (General Practice)
909 E REPUBLIC RD STE D200
SPRINGFIELD, MO 65807
Greene County (417) 883-7889
CHRISTINA MARIE CAPPS MD
Internal Medicine
909 E REPUBLIC RD STE D200
SPRINGFIELD, MO 65807
Greene County (417) 883-7889
417 RHEUMATOLOGY LLC
Internal Medicine (Rheumatology)
909 E REPUBLIC RD STE D200
SPRINGFIELD, MO 65807
Greene County (417) 501-2644

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 Ralph Duda's NPI number?

The NPI number for Ralph Duda is 1356436406. It was assigned to this individual provider in the NPPES registry on October 4, 2006.

Where is Ralph Duda located?

Ralph Duda practices at 909 E Republic Rd Ste D200, Springfield, MO 65807. The listed phone number is (417) 883-7889.

What is Ralph Duda's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Is Ralph Duda enrolled in Medicare?

Yes. Ralph Duda is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Ralph Duda's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ralph Duda reassigns Medicare benefits to Ahs Oklahoma Heart LLC (Tulsa, OK). 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 Ralph Duda's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Ralph Duda was last updated on April 13, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years 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.