Quick answers
- Does Lawrence G. Mendelow accept Medicare assignment?
- Yes. Medicare's clinician data says Lawrence G. Mendelow accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Lawrence G. Mendelow see?
- In 2024, CMS data shows 271 Original Medicare patients and 583 services for Lawrence G. Mendelow. This counts Original Medicare only and measures volume, not quality.
- What is Lawrence G. Mendelow's NPI number?
- 1811932502. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Lawrence G. Mendelow, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 271 |
|---|---|
| Services billed to Medicare | 583 |
| Different services or procedures | 66 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)82 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)53 services
- Diagnostic exam of anus using an endoscope (46600)52 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)48 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)43 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure73%
- Arthritis53%
- Anxiety28%
- Ischemic heart disease27%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)27%
Hospitals where Lawrence G. Mendelow works
Medicare's Facility Affiliation Data lists Lawrence G. Mendelow at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Barnes Jewish HospitalSaint Louis, MO · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 260032
- Barnes-Jewish West County HospitalCreve Coeur, MO · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 260162
- Missouri Baptist Medical CenterSaint Louis, MO · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 260108
Practice locations
Addresses where Lawrence G. Mendelow is enrolled with Medicare (CMS data updated October 2, 2026).
- 3015 N Ballas RdSaint Louis, MO 63131 (314) 362‑5298
- 555 N New Ballas Rd, 265 ClinicSaint Louis, MO 63141 (314) 362‑5298
Group practices
Medicare enrollment lists Lawrence G. Mendelow as a member of this group (CMS data updated October 2, 2026).
- Washington University3,029 clinicians in the group
Specialties
Find other Colorectal Surgery (Proctology) doctors in Missouri →
Other colorectal surgeons in Saint Louis
Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.
Other clinicians in Washington University
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Duke University School Of Medicine |
| Graduation year | 1983 (43 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1811932502 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians