Mark Reiter, M.D.
NPI 1902864408 · Internal Medicine Physician · Oak Lawn, IL
Mark Reiter, M.D. is a Internal Medicine Physician provider in Oak Lawn, IL (NPI 1902864408).
Provider details
- NPI number
- 1902864408
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
83% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
164 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 110 | $99 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 42 | $153 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 12 | $134 |
Typical Medicare-allowed amounts for these services range $99–$153 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 86 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Alprazolam | 158 | 32 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 136 | 18 |
| Prednisone | 111 | 27 |
| Atorvastatin Calcium | 111 | 31 |
| Amlodipine Besylate | 86 | 28 |
| Levothyroxine Sodium | 63 | 19 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$300 across 12 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-03
- Last updated
- 2025-09-11
Frequently asked questions
- What is Mark Reiter's NPI number?
- Mark Reiter's National Provider Identifier (NPI) is 1902864408, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Reiter's specialty?
- Mark Reiter is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Reiter located?
- Mark Reiter's practice location on file with NPPES is 4400 W 95th St, Oak Lawn, IL 60453-2654.
- What is Mark Reiter's phone number?
- The practice phone number listed in the NPPES registry for Mark Reiter is (708) 499-2323.
- Is Mark Reiter's NPI active?
- Yes — Mark Reiter's NPI (1902864408) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.