1. Home
  2. Directory
  3. Missouri
  4. Saint Louis
  5. Internal Medicine
  6. NPI Profile

DR. GUY WILLIAM FELDER M.D.
NPI 1427159714
Internal Medicine in Saint Louis, MO

Active since September 26, 2006PECOS EnrolledAccepts Medicare Assignment
89.23/100
CMS Quality Rating
5640C TELEGRAPH RD, SAINT LOUIS, MO 63129(314) 293-4413 Get Directions Write a Review

NPPES record last updated: November 13, 2025. Verified against the NPPES registry weekly; last sync: October 04, 2026.

About Dr. Guy William Felder M.d. NPPES

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

DR. GUY WILLIAM FELDER M.D. (NPI 1427159714) is an individual internal medicine provider in Saint Louis, Missouri, licensed in Missouri (R8J13) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS and is a graduate of Saint Louis University School Of Medicine (1988).

NPPES Registry Identity

NPI1427159714
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. GUY WILLIAM FELDERCredential: M.D.
Location Address5640C TELEGRAPH RDSaint Louis, MO 63129-4243
Mailing Address10433 Starhill Acres DrSaint Louis, MO 63128-3243 · (314) 525-1900 · Fax (314) 525-4148
Phone(314) 293-4413
Sole ProprietorNo
Medical School CMSSaint Louis University School Of MedicineGraduated 1988
Enumeration DateSeptember 26, 2006
Last NPPES UpdateNovember 13, 2025
NPPES CertifiedNovember 13, 2025
✔ NPI 1427159714 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MO · R8J13
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.
5640C TELEGRAPH RD, Saint Louis, MO 63129
Open in Google Maps ↗

Other Identifiers 1

OtherP00648706MO · Rr Medicare

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Insurance Company.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Guy William Felder M.d. 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 ID5799863601
PECOS Enrollment IDI20080417000366
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.

Areas of Expertise CMS Part B claims 2

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.

Emergency department visit with high level of medical decision making 99285
An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.
28 services26 patients
Emergency department visit with moderate level of medical decision making 99284
An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.
22 services22 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63129 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
$128.28 typical visit price
range $55.65 – $169.38
Typical copayment $32.07 (range $13.91 – $42.34)
Most-billed visit code 99204
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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

89.23/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality84.14
Improvement Activities40

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 Guy Felder's NPI number?

The NPI number for Guy Felder is 1427159714. It was assigned to this individual provider in the NPPES registry on September 26, 2006.

Where is Guy Felder located?

Guy Felder practices at 5640C Telegraph Rd, Saint Louis, MO 63129. The listed phone number is (314) 293-4413.

What is Guy Felder's specialty?

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

Is Guy Felder enrolled in Medicare?

Yes. Guy Felder 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.

What insurance does Guy Felder accept?

Health plans from Oscar Insurance Company list Guy Felder 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 Guy Felder was last updated on November 13, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.