MARK ANDREW WALSHAUSER M.D.
NPI 1306020664
Internal Medicine - Hematology & Oncology in O Fallon, IL

Active since December 21, 2007PECOS EnrolledAccepts Medicare Assignment
77.67/100
CMS Quality Rating
321 REGENCY PARK STE 100, O FALLON, IL 62269(618) 416-7970(618) 416-7971 Get Directions Write a Review

NPPES record last updated: December 12, 2023. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Mark Andrew Walshauser M.d. NPPES

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

MARK ANDREW WALSHAUSER M.D. (NPI 1306020664) is an individual hematology & oncology provider in O Fallon, Illinois, licensed in Illinois (036128331) and active in the NPI registry since December 2007. He is enrolled in Medicare PECOS, is affiliated with St Johns Hospital, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1306020664
Entity TypeIndividualMale
Primary Taxonomy207RH0003X
Provider Legal NameMARK ANDREW WALSHAUSERCredential: M.D.
Location Address321 REGENCY PARK STE 100O Fallon, IL 62269-1887
Mailing AddressPo Box 25228Decatur, IL 62525-5228 · (217) 329-3232 · Fax (217) 233-1670
Fax(618) 416-7971
Sole ProprietorNo
Medical School CMSOtherGraduated 2006
Enumeration DateDecember 21, 2007
Last NPPES UpdateDecember 12, 2023
NPPES CertifiedDecember 8, 2023
NPI 1306020664 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RH0003X
License Licensed in IL · 036128331
Definition
An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.
Also ListedInternal MedicineTaxonomy 207R00000X · License 2010024540 (MO)
321 REGENCY PARK STE 100, O Fallon, IL 62269

Secondary Practice Locations 2

Location 1Broadway Plaza Suite 1Sparta, IL 62286-1800 · Phone (618) 416-7970 · Fax (618) 416-7971
Location 212860 Troxler Ave Ste 135Highland, IL 62249-2898 · Phone (618) 416-7970 · Fax (618) 416-7971

Other Identifiers 1

Medicaid036128331IL

Accepted 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

Mark Andrew Walshauser 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 ID345365227
PECOS Enrollment IDI20140711000552
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 63

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, ferric carboxymaltose, 1 mg J1439
Ferric carboxymaltose is an iron supplement injection. It's given when your body needs more iron than you can consume through diet, like in anemia. The injection is administered by a healthcare professional into a vein.
59,250 services37 patients
Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml Q9967
Low osmolar contrast material with 300-399 mg/ml iodine concentration is a diagnostic tool used in imaging procedures. It helps to enhance the visibility of specific areas in the body, aiding in accurate diagnosis. It's safe and generally well-tolerated by patients.
12,150 services68 patients
Injection, aprepitant, 1 mg J0185
Aprepitant injection is a medication used to prevent nausea and vomiting caused by chemotherapy. It works by blocking certain substances in the brain that trigger these symptoms. The dosage is based on your medical condition and response to treatment.
7,670 services11 patients
Injection, dexamethasone sodium phosphate, 1 mg J1100
Dexamethasone sodium phosphate is a medication given via injection. It is a type of steroid that helps reduce inflammation and immune responses. It can be used to treat a variety of conditions, such as allergies, skin conditions, arthritis, and more.
3,814 services38 patients
Injection, palonosetron hcl, 25 mcg J2469
Palonosetron HCL is an injection used to prevent nausea and vomiting caused by chemotherapy. It works by blocking a natural substance (serotonin) in the body that can cause vomiting. This helps improve your comfort during cancer treatment.
2,040 services27 patients
Injection of additional new drug or substance into vein 96375
This procedure involves introducing a new medication or substance into your bloodstream via a vein. It's typically done using a small needle. The substance can help treat various conditions or assist in diagnostic procedures. It's generally safe and monitored by professionals.
1,222 services57 patients

Hospital Affiliations CMS Care Compare 5

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

St Johns Hospital

Acute Care Hospitals · Springfield, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number140053
Location800 E Carpenter StSpringfield, IL 62769 · Sangamon County
Emergency services Birthing friendly

St Josephs Hospital

Acute Care Hospitals · Breese, IL
OwnershipVoluntary non-profit - Church
CMS Certification Number140145
Location9515 Holy Cross LnBreese, IL 62230 · Clinton County
Emergency services Birthing friendly

Hshs St Elizabeth's Hospital

Acute Care Hospitals · O Fallon, IL
4/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number140187
LocationOne St Elizabeth BoulevardO Fallon, IL 62269 · St. Clair County
Emergency services Birthing friendly

St Joseph's Hospital

Critical Access Hospitals · Highland, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number141336
Location12866 Troxler AvenueHighland, IL 62249 · Madison County
Emergency services

Sparta Community Hospital

Critical Access Hospitals · Sparta, IL
OwnershipGovernment - Hospital District or Authority
CMS Certification Number141349
Location818 E BroadwaySparta, IL 62286 · Randolph County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 62269 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
$173.35 typical visit price
range $56.28 – $173.35
Typical copayment $43.33 (range $14.07 – $43.33)
Most-billed visit code 99205
Established Patient
$99.71 typical visit price
range $17.51 – $139.99
Typical copayment $24.92 (range $4.37 – $34.99)
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.

77.67/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality73.39
Promoting Interoperability83
Improvement Activities40
Cost52.7

Other Providers at the Same Location NPPES 8

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

Nurse Practitioner (Family)
321 REGENCY PARK STE 100
O FALLON, IL 62269
Internal Medicine (Hematology & Oncology)
321 REGENCY PARK STE 100
O FALLON, IL 62269
Internal Medicine (Medical Oncology)
321 REGENCY PARK STE 100
O FALLON, IL 62269
Internal Medicine (Hematology & Oncology)
321 REGENCY PARK STE 100
O FALLON, IL 62269
Physician Assistant
321 REGENCY PARK STE 100
O FALLON, IL 62269
Radiology (Radiation Oncology)
321 REGENCY PARK STE 100
O FALLON, IL 62269
Nurse Practitioner
321 REGENCY PARK STE 100
O FALLON, IL 62269
Radiology (Radiation Oncology)
321 REGENCY PARK STE 100
O FALLON, IL 62269

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 Mark Walshauser's NPI number?

The NPI number for Mark Walshauser is 1306020664. It was assigned to this individual provider in the NPPES registry on December 21, 2007.

Where is Mark Walshauser located?

Mark Walshauser practices at 321 Regency Park Ste 100, O Fallon, IL 62269. The listed phone number is (618) 416-7970.

What is Mark Walshauser's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Is Mark Walshauser enrolled in Medicare?

Yes. Mark Walshauser 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 Mark Walshauser accept?

Health plans from Ambetter Health, Ambetter Health of Delaware and Ambetter from Home State Health list Mark Walshauser 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 Mark Walshauser affiliated with any hospitals?

According to CMS data, Mark Walshauser is affiliated with St Johns Hospital, St Josephs Hospital, Hshs St Elizabeth's Hospital, St Joseph's Hospital and Sparta Community Hospital.

When was this NPI record last updated?

The NPPES record for Mark Walshauser was last updated on December 12, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.