Doctor profile · Federal record
Dr. John Maciejewski, M.D.
Hematology (Internal Medicine) Physician (CMS: Hematology) · Internal Medicine Physician · Hematology (Internal Medicine) Physician · Hematology & Oncology Physician · Ann Arbor, MI
- NPI 1235334137
- Accepts Medicare
- 25 yrs in practice
- Licensed in 2 states
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1500 E Medical Center Dr
Ann Arbor, MI 481095000
(734) 936-4000 - Mailing address
-
3621 S State St
Ann Arbor, MI 481081633
Credentials & registration
- NPI registered
- June 2007 — 19 yrs on file
- Profile last updated
- February 19, 2020
- Year of graduation
- 2001 — 25 yrs since
- Specialty taxonomy
- 207RH0000X — NUCC code
- State licenses (2)
- Michigan #4301116418 · Illinois #036-109957
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1235334137. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
321
Distinct HCPCS
5
Medicare allowed
$41,504
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 182 | 31 | $120 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 92 | 28 | $145 | |
99239 |
Hospital discharge day management, more than 30 minutes | 18 | 17 | $117 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 17 | 13 | $177 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 12 | 11 | $99 |
In context: peer comparison
Among 11 peers in this city , average services per provider: 57. This provider delivers 5.6× the peer median.Open Payments
Industry payments received
All-time total
$215
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| National Marrow Donor Program | 1 | $214.51 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
129
Patients
11
Total drug cost
$332,576
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Acyclovir | Generic | 34 | 11 | $1,040 |
| Azithromycin | Generic | 24 | 0 | $311 |
| Ursodiol | Generic | 24 | 0 | $2,615 |
| Jakafi (Ruxolitinib Phosphate) | Brand | 13 | 0 | $232,966 |
| Cresemba (Isavuconazonium Sulfate) | Brand | 12 | 0 | $76,955 |
| Magnesium Sulfate | Generic | 11 | 0 | $165 |
| Posaconazole | Generic | 11 | 0 | $18,524 |
Hospital affiliations
Frequently asked questions
What is Dr. John Maciejewski's medical specialty?
Dr. John Maciejewski practices Hematology (Internal Medicine) Physician in Ann Arbor, MI.
Where does Dr. John Maciejewski practice?
Dr. John Maciejewski practices at 1500 E Medical Center Dr, Ann Arbor, MI 481095000. Office phone: 7349364000.
What is Dr. John Maciejewski's NPI?
Dr. John Maciejewski's National Provider Identifier (NPI) is 1235334137, issued by NPPES.
Does Dr. John Maciejewski accept Medicare assignment?
Yes. Dr. John Maciejewski accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. John Maciejewski commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Established patient office or other outpatient visit (HCPCS 99215); Hospital discharge day management (HCPCS 99239). Source: CMS Medicare Physician & Other Practitioners file.