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- 3655 Vista Ave, Saint Louis, MO 63110
About Dr. Fesler
Mark J. Fesler, MD practices hematology & oncology in Saint Louis, MO. Mark is a 2003 graduate of Saint Louis University School of Medicine. Mark is also listed as specializing in internal medicine. According to Medicare claims data, Mark cared for 391 Medicare patients across 1,452 services. The services billed most often include established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more, subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes, and initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes. The provider's National Provider Identifier (NPI) is 1235204066.
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
- (314) 977-4340
- Email not available
Is this your home address or personal number? Hide it
Practice Locations
3655 VISTA AVE
Saint Louis, MO 63110
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
Blood & Lymph Disorders
Blood Cancers
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
Digestive Cancers
Endocrine Cancers
Endocrine tumors
Gastrointestinal cancer
General oncology
Genetic Blood Disorders
Gynecologic cancer
Gynecologic Cancers
Head & Neck Cancers
Head and neck cancer
Neurologic Cancers
Oncologic emergencies
Ophthalmologic oncology
Skin cancer
Skin Cancers
Urologic Cancers
Procedures & services
Biopsies & Diagnostics
Cancer care
Pain & wellness
Most searched procedures
Blood disorder care
Cancer Therapies
Cancer therapy
- Chemo allergy desensitization
- Oral chemotherapy management
- Radiation oncology consultation
- Spinal chemo injection
Cellular Therapies
Consultations
Diagnostic testing
Hematology Treatments
Imaging
Infusions
Interventional oncology
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
Vascular access care
Procedures Most Often Billed to Medicare
1,452 services · 391 patients · 5 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
864 | More than most peers in Hematology & Oncology |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | Office visit | 99233 |
421 | More than most peers in Hematology & Oncology |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
124 | More than most peers in Hematology & Oncology |
| New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more | Office visit | 99205 |
28 | As often as other peers in Hematology & Oncology |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
15 | Less 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 cancer specialists at this location 7
Same specialty, same street address — most likely the same department or group.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other cancer specialists in Saint Louis 6
Same specialty, same city.
More connections — 15 related providers in 2 groups
Trained at Saint Louis University School of Medicine 7
Other providers in the same specialty who trained at the same institution.
Class of 2003 at Saint Louis University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Common questions
What kind of doctor is Dr. Fesler?
Dr. Fesler is a cancer specialist in Saint Louis, MO. That is the designation recorded for this NPI in the federal registry, where it is listed as “Hematology & Oncology”.
NPI registry
What is Dr. Fesler's address?
Dr. Fesler is listed at 3655 Vista Ave, Saint Louis, MO 63110. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Fesler?
The number on file is (314) 977-4340. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Dr. Fesler's NPI number?
Dr. Fesler's National Provider Identifier is 1235204066. 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. Fesler train?
Dr. Fesler attended Saint Louis University School of Medicine, graduating in 2003. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Fesler been practicing?
Dr. Fesler has 23 years experience. Calculated from a graduation year of 2003, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Fesler perform?
According to Medicare billing data, Dr. Fesler the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Fesler confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Fesler. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.