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Edit this profileWhere to find Mark A. Walshauser, M.D.
- O Fallon location main office
321 Regency Park Ste 100, O Fallon, IL 62269 - Sparta location
Broadway Plaza Suite 1, Sparta, IL 62286 - Highland location
12860 Troxler Ave Ste 135, Highland, IL 62249
About Dr. Walshauser
Mark A. Walshauser, M.D. practices hematology/oncology in O Fallon, IL. Mark is also listed as specializing in internal medicine and hematology & oncology. According to Medicare claims data, Mark cared for 3,144 Medicare patients across 97,058 services. The services billed most often include injection, ferric carboxymaltose, 1 mg, low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml, and injection, aprepitant, 1 mg. The provider's National Provider Identifier (NPI) is 1306020664.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (618) 416-7970
- Email not available
Practice Locations
321 REGENCY PARK STE 100
O Fallon, IL 62269
Broadway Plaza Suite 1
Sparta, IL 62286
12860 Troxler Ave Ste 135
Highland, IL 62249
Conditions Commonly Evaluated or Treated
Within Hematology and Oncology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- Anemia
- Blood clots
- Breast cancer
- Colon cancer
- Iron-deficiency anemia
- Leukemia
- Lung cancer
- Lymphoma
- Prostate cancer
Advanced Cancers
- Cancer That Has Spread
Blood & Lymph Disorders
- Enlarged spleen
- Swollen Lymph Nodes
Blood Cancers
- Multiple Myeloma
- Myelodysplastic Syndrome
Blood Disorders
- Bleeding Disorders
- Blood Clot in Lung
- Blood Clotting Gene Mutation
- Deep vein thrombosis
- Hemochromatosis
- High Platelet Count
- High White Blood Cell Count
- Low Platelets
- Low White Blood Cell Count
- Thick Blood
- Unexplained Bruising
Blood disorders
- Bone Marrow Scarring
- Hemolytic Anemia in Children
- Pre-Myeloma Protein In Blood
- Vitamin B12 deficiency anemia
Bone & Soft Tissue Cancers
- Bone tumors
- Soft-tissue sarcoma
Digestive Cancers
Endocrine Cancers
Endocrine tumors
- Neuroendocrine Tumors
Gastrointestinal cancer
- Anal cancer
- Appendix cancer
- Bile duct cancer
- Gallbladder cancer
General oncology
- Cancer of unknown primary
Genetic Blood Disorders
- Sickle cell disease
- Thalassemia
Gynecologic cancer
Gynecologic Cancers
Head & Neck Cancers
- Oral cancer
Head and neck cancer
Neurologic Cancers
- Brain tumor
Oncologic emergencies
- High calcium from cancer
Ophthalmologic oncology
Skin cancer
Skin Cancers
- Melanoma
Urologic Cancers
Procedures & services
Most searched procedures
- Blood transfusion
- Chemotherapy
- Immunotherapy
- Targeted therapy
Biopsies & Diagnostics
- Bone Marrow Biopsy
- Lumbar puncture
- Lymph Node Biopsy
Blood disorder care
- Blood Exchange Transfusion
- Photopheresis
Cancer Therapies
- Hormone Therapy For Cancer
Cancer therapy
- Chemo allergy desensitization
- Oral chemotherapy management
- Radiation oncology consultation
- Spinal chemo injection
Cellular Therapies
- CAR-T Therapy
- Stem Cell Transplant
Consultations
- Cancer Survivorship Care Plan
- Clinical Trial Screening
- Second Opinion For Cancer
Diagnostic testing
- Circulating tumor cell test
Hematology Treatments
- Blood Clot Management
- Plasmapheresis
- PRP Injection
- Therapeutic Blood Draw
Imaging
- PET Scan
Infusions
- Clotting Factor Replacement
- Iron Infusion
- IV fluids
- IVIG Infusion
Interventional oncology
- Radiofrequency ablation
- TACE Chemoembolization
Supportive Cancer Care
- Bone Strengthening Injections For Cancer
- Pain Management For Cancer
- Red Blood Cell Booster Shot
- White Blood Cell Booster Injection
Supportive cancer care
- Cancer nutrition counseling
- Chemo brain treatment
- Cold cap therapy for hair loss
- Fertility Preservation for Teens Before Cancer Treatment
- Hyperbaric oxygen for radiation damage
- Lymphedema Drainage Therapy
- Palliative cancer care
Surgical & Vascular Access
- Chemo port placement
- Chemo port removal
- Draining lung fluid
- Paracentesis
- PICC line placement coordination
Testing & Genetics
- Cancer Genetic Testing
- Cancer Tumor Profiling
- Liquid Biopsy
Vascular access care
- Chemo port check
- Chemo Port Flush And Maintenance
- PICC line dressing change
Procedures Most Often Billed to Medicare
97,058 services · 3,144 patients · 25 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Insertion of needle into vein for collection of blood sample | Procedure | 36415 |
907 | More often than most peers in Hematology/Oncology |
| Injection of additional new drug or substance into vein | Treatment | 96375 |
1,222 | More than most peers in Hematology/Oncology |
| Administration of chemotherapy into vein, 1 hour or less | Treatment | 96413 |
582 | More than most peers in Hematology/Oncology |
| Injection, ferric carboxymaltose, 1 mg | Drug given | J1439 |
59,250 | More often than most peers in Hematology/Oncology |
| Injection, aprepitant, 1 mg | Drug given | J0185 |
7,670 | As often as other peers in Hematology/Oncology |
| Injection, dexamethasone sodium phosphate, 1 mg | Drug given | J1100 |
3,814 | More than most peers in Hematology/Oncology |
| Injection, palonosetron hcl, 25 mcg | Drug given | J2469 |
2,040 | More than most peers in Hematology/Oncology |
| Injection, ondansetron hydrochloride, per 1 mg | Drug given | J2405 |
924 | More often than most peers in Hematology/Oncology |
| Injection, magnesium sulfate, per 500 mg | Drug given | J3475 |
629 | More often than most peers in Hematology/Oncology |
| Injection, carboplatin, 50 mg | Drug given | J9045 |
344 | More often than most peers in Hematology/Oncology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other hematology/oncology specialists at this location 4
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 3
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 3
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 24 related providers in 3 groups
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2006 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Insertion of needle into vein for collection of blood sample 8
Providers in IL who bill this service to Medicare most often.
Common questions
What does Mark A. Walshauser specialize in?
Mark A. Walshauser is a hematology/oncology in O Fallon, IL. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where is Mark A. Walshauser located?
Mark A. Walshauser is listed at 321 Regency Park Ste 100, O Fallon, IL 62269. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Mark A. Walshauser's phone number?
The number on file is (618) 416-7970. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Mark A. Walshauser's NPI number?
Mark A. Walshauser's National Provider Identifier is 1306020664. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Mark A. Walshauser train?
Mark A. Walshauser attended Other, graduating in 2006. This comes from the CMS National Downloadable File.
CMS public data
How long has Mark A. Walshauser been practicing?
Mark A. Walshauser has 20 years experience. Calculated from a graduation year of 2006, reported in the CMS National Downloadable File.
CMS public data
What does Mark A. Walshauser do most often?
According to Medicare billing data, Mark A. Walshauser performs procedures including insertion of needle into vein for collection of blood sample; provides treatments such as injection of additional new drug or substance into vein and administration of chemotherapy into vein, 1 hour or less, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Mark A. Walshauser confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Mark A. Walshauser. If this is you, claiming it is free.
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