Michael Grendon, M.D.
NPI 1922007962 · Internal Medicine Physician · Chicago, IL
Michael Grendon, M.D. is a Internal Medicine Physician provider in Chicago, IL (NPI 1922007962).
Provider details
- NPI number
- 1922007962
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 036061003 (IL)
Specialties & taxonomies
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
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
763 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 | 515 | $124 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 149 | $75 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 46 | $127 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 39 | $109 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 14 | $92 |
Typical Medicare-allowed amounts for these services range $75–$127 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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 · 72 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 306 | 75 |
| Amlodipine Besylate | 224 | 59 |
| Levothyroxine Sodium | 193 | 46 |
| Furosemide | 138 | 36 |
| Metoprolol Succinate | 126 | 29 |
| Apixabanbrand: Eliquis | 109 | 16 |
| Gabapentin |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$145 across 6 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
- 2005-07-20
- Last updated
- 2022-06-13
- Certified
- 2022-06-13
Frequently asked questions
- What is Michael Grendon's NPI number?
- Michael Grendon's National Provider Identifier (NPI) is 1922007962, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Grendon's specialty?
- Michael Grendon is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Grendon located?
- Michael Grendon's practice location on file with NPPES is 2800 N Sheridan Rd, Chicago, IL 60657-6156.
- What is Michael Grendon's phone number?
- The practice phone number listed in the NPPES registry for Michael Grendon is (773) 472-5803.
- Is Michael Grendon's NPI active?
- Yes — Michael Grendon's NPI (1922007962) is active in the NPPES registry as of the last update on 2022-06-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.