Physician Profile
Unclaimed ProfileAbout WALSHAUSER
Mark Andrew 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.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What does Dr. Walshauser specialize in?
Dr. Walshauser is a hematology/oncology in O Fallon, IL. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “HEMATOLOGY/ONCOLOGY”.
NPI registry
Where is Dr. Walshauser located?
Dr. 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 Dr. Walshauser's phone number?
The number on file is (618) 416-7970. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Walshauser's NPI number?
Dr. 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 Dr. Walshauser go to medical school?
Dr. Walshauser attended Other, graduating in 2006. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Walshauser been practicing?
Dr. Walshauser has 20 years experience. Calculated from a graduation year of 2006, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Walshauser do most often?
According to Medicare billing data, Dr. 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 Dr. Walshauser confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Walshauser. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (618) 416-7970
- Email not available
Practice Locations
321 REGENCY PARK STE 100
O Fallon, IL 62269
Procedures Most Often Billed to Medicare
97,058 services · 3,144 patients · 25 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Insertion of needle into vein for collection of blood sample | Procedure | 36415 |
907 |
| Injection of additional new drug or substance into vein | Treatment | 96375 |
1,222 |
| Administration of chemotherapy into vein, 1 hour or less | Treatment | 96413 |
582 |
| Injection, ferric carboxymaltose, 1 mg | Drug given | J1439 |
59,250 |
| Injection, aprepitant, 1 mg | Drug given | J0185 |
7,670 |
| Injection, dexamethasone sodium phosphate, 1 mg | Drug given | J1100 |
3,814 |
| Injection, palonosetron hcl, 25 mcg | Drug given | J2469 |
2,040 |
| Injection, ondansetron hydrochloride, per 1 mg | Drug given | J2405 |
924 |
| Injection, magnesium sulfate, per 500 mg | Drug given | J3475 |
629 |
| Injection, carboplatin, 50 mg | Drug given | J9045 |
344 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
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Claim this profileRelated 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.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.