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JOHN B HAMMONS M.D.
NPI 1487601761
Obstetrics & Gynecology in Saint Charles, MO

Active since May 30, 2006PECOS Enrolled
300 1ST CAPITOL DR, SAINT CHARLES, MO 63301(636) 947-5000(636) 947-5090 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About John B Hammons M.d. NPPES

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

JOHN B HAMMONS M.D. (NPI 1487601761) is an individual obstetrics & gynecology provider in Saint Charles, Missouri, licensed in Missouri (2002015290) and active in the NPI registry since May 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1487601761
Entity TypeIndividualMale
Primary Taxonomy207V00000X
Provider Legal NameJOHN B HAMMONSCredential: M.D.
Location Address300 1ST CAPITOL DRSaint Charles, MO 63301-2844
Mailing Address43 Country Club PlBelleville, IL 62223-1934 · (618) 394-9436 · Fax (618) 394-9476
Phone(636) 947-5000
Fax(636) 947-5090
Sole ProprietorNo
Enumeration DateMay 30, 2006
Last NPPES UpdateJuly 8, 2007
✔ NPI 1487601761 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
License✔ Licensed in MO · 2002015290
Definition
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.
300 1ST CAPITOL DR, Saint Charles, MO 63301
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

John B Hammons 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 John Hammons reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Ssm Health Care St. Louis
Same address
Emergency Medicine
300 1ST CAPITOL DR
Saint Charles, MO 63301
  • Reassigned Medicare billing, Missouri enrollment
  • 741 clinicians in this Medicare group
NPI 1427002922 (636) 947-5000

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 63301 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
$69.50 typical visit price
range $17.76 – $137.92
Typical copayment $17.37 (range $4.44 – $34.48)
Most-billed visit code 99213
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.

KATHLEEN F. CHRISTLIEB PA
Physician Assistant
300 1ST CAPITOL DR
SAINT CHARLES, MO 63301
St. Charles County (636) 947-5000
JULIE L ROACH CRNA
Nurse Anesthetist, Certified Registered
300 1ST CAPITOL DR
SAINT CHARLES, MO 63301
St. Charles County (314) 989-3000
DR. ROMEL IZQUIERDO-MALON M.D.
Internal Medicine
300 1ST CAPITOL DR
SAINT CHARLES, MO 63301
St. Charles County (314) 317-0600
RACHAEL KING RD
Dietitian, Registered
300 1ST CAPITOL DR
SAINT CHARLES, MO 63301
St. Charles County (636) 947-5156
ANGELA GLASS MSOTR/L
Occupational Therapist
300 1ST CAPITOL DR
SAINT CHARLES, MO 63301
St. Charles County (636) 947-5000
FRANK S CALANDRINO JR MD LLC
Internal Medicine (Pulmonary Disease)
300 1ST CAPITOL DR
SAINT CHARLES, MO 63301
St. Charles County (314) 330-8616
DR. DAVID N MAYWRIGHT PHARMD
Pharmacist
300 1ST CAPITOL DR
SAINT CHARLES, MO 63301
St. Charles County (314) 541-9482
ANTHONY W JENNINGS M.D.
Emergency Medicine
300 1ST CAPITOL DR
SAINT CHARLES, MO 63301
St. Charles County (636) 947-5000

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 John Hammons's NPI number?

The NPI number for John Hammons is 1487601761. It was assigned to this individual provider in the NPPES registry on May 30, 2006.

Where is John Hammons located?

John Hammons practices at 300 1st Capitol Dr, Saint Charles, MO 63301. The listed phone number is (636) 947-5000.

What is John Hammons's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is John Hammons enrolled in Medicare?

Yes. John Hammons is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for John Hammons's services?

According to the CMS Revalidation Reassignment List (October 2026 release), John Hammons reassigns Medicare benefits to Ssm Health Care St. Louis (Saint Charles, MO). 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 John Hammons's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does John Hammons accept?

Health plans from Anthem Blue Cross and Blue Shield list John Hammons 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 John Hammons was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.