Catherine Louise Ash, M.D.
Catherine Louise Ash, M.D. has practiced internal medicine for 11+ years, working in independent practice. A Saint Louis University School of Medicine graduate since 2015, she brings 11+ years of experience. CMS Medicare data shows her patients commonly have hypertension, high cholesterol, and arthritis.
At a glance
- Prescribes opioids less than 29% of reporting doctors in Illinois
- Uses generic medications more than 51% of reporting doctors in Illinois
- Virtual visits available — no app or travel required
Older · 139dNPPES updated 2025-12-18 · verify on CMS
Contact & Location
Practice Location
2122 Troy Rd Ste 130, Edwardsville, IL 62025-2540
How Does This Doctor Compare?
Based on Medicare data, this doctor prescribes opioid pain medications conservatively, favors affordable generic drugs over brand-name ones.
Opioid Rx
↓ Lower = better2.71%
Illinois avg: 4.5 · US avg: 5.1
✓ Higher than most doctors nationally(-2.4 pts)
2.71% of this doctor's prescriptions are opioid pain medications. Lower means more cautious prescribing.
Generic Rx
↑ Higher = better88.2%
Illinois avg: 82.9 · US avg: 82.8
✓ Higher than most doctors nationally(+5.4 pts)
Typical range among reporting doctors in IllinoisHow often this doctor prescribes affordable generic drugs instead of expensive brand-name ones.
Medicare Patients
126
Unique beneficiaries
Standard volumePrescription Recipients
472
Patients prescribed
Prescriptions Written
5,469
Total claims
Total Medicare drug cost: $435k
Percentile rankings compared against 2,844 reporting peers in Illinois.
Data Note: Sourced from CMS Medicare Provider Utilization & Payment Data. Percentile rankings compare this provider against all peers with reported data in the same state. Updated annually to reflect the latest federal reporting cycle.
What This Doctor Treats Most
Based on Medicare claims data — here's what patients commonly see this doctor for
Based on Medicare data, this doctor primarily manages Hypertension, High Cholesterol, and Arthritis.
High blood pressure — a leading risk factor for heart disease and stroke
US avg: 70.2%↓ Fewer patients than average (-3%) — less common here
Elevated cholesterol or triglycerides that increase heart disease risk
US avg: 70.4%↓ Fewer patients than average (-14%) — less common here
Joint inflammation causing pain, swelling, and stiffness
US avg: 49.3%↑ More patients than average (+4%) — a focus area for this doctor
Conditions affecting emotional state, including depression and bipolar disorder
A mood disorder causing persistent sadness and loss of interest in activities
US avg: 31.8%↑ More patients than average (+4%) — a focus area for this doctor
Excessive worry or fear that interferes with daily life
US avg: 34.1%↓ Fewer patients than average (-5%) — less common here
Gradual loss of kidney function over time, often linked to diabetes or hypertension
US avg: 29.6%↓ Fewer patients than average (-2%) — less common here
A condition where the body cannot properly regulate blood sugar levels
US avg: 34.5%↓ Fewer patients than average (-9%) — less common here
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
$88 received from industry
3 transactions reported in 2024 ·Low tier
Payments include consulting fees, speaking honoraria, food & beverage, travel, research support, and ownership interests from drug and medical device manufacturers. Disclosure is required by the federal Physician Payments Sunshine Act. These payments do not necessarily indicate conflicts of interest. National median: $338 across 136 000 tracked providers.
Tiers — Low: under $500 · Moderate: $500-5 000 · High: $5 000-25 000 · Very High: $25 000+. Source: CMS Open Payments 2024, attributed to Catherine Louise Ash's NPI.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Graduated medical school · 2015
Saint Louis University School of Medicine
Board certified · Dec 17, 2025
CMS-verified certification date
11 years in practice
Established
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Taxonomy: 207R00000X
Education & Training
Saint Louis University School of Medicine (Class of 2015)
Mailing address
'Po Box 959203 St Louis Mo 63195', Saint Louis, MO 63195-0001
Differs from practice location
Virtual Internal Medicine Care With Catherine Louise Ash
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Catherine Louise Ash for blood pressure monitoring, cholesterol management, arthritis follow-ups — no travel to Edwardsville required. The office sends a secure video link before your appointment. Most visits take 15–30 minutes. Medicare enrolled per CMS records.
Frequently Asked Questions
Common questions about Catherine Louise Ash
Dr. Ash is listed as active in the NPI registry with telehealth listed in Edwardsville, IL. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (618) 800-4500.
Sourced from CMS NPPES · OIG LEIE · CMS Medicare Part D · CMS Open Payments 2024 · CMS Physician Comparator. See Data Methodology.
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Contact Catherine Louise Ash
Practice Location
2122 Troy Rd Ste 130, Edwardsville, IL 62025-2540
Mailing Address
'Po Box 959203 St Louis Mo 63195', Saint Louis, MO 63195-0001
This is a provider directory. Contact the office directly to schedule appointments.
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