John Mcmillin, M.D.
NPI 1831432343 · Psychiatry Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Mcmillin, M.D. is a Psychiatry Physician provider in Chicago, IL (NPI 1831432343).
Provider details
- NPI number
- 1831432343
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036147447 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
13 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
320 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 | 320 | $109 |
Typical Medicare-allowed amounts for these services range $109–$109 (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 · 52 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Quetiapine Fumarate | 443 | 54 |
| Trazodone Hcl | 413 | 55 |
| Aripiprazole | 286 | 43 |
| Bupropion Hclbrand: Bupropion Xl | 276 | 37 |
| Lamotrigine | 265 | 36 |
| Olanzapine | 239 | 27 |
| Duloxetine Hcl | 220 |
Practice location
Mailing address
Additional practice locations (1)
- 1341 Warren AveDowners Grove, IL 60515-3437Phone: (630) 719-5454
Registry dates
- Enumerated
- 2013-04-03
- Last updated
- 2025-10-09
- Certified
- 2025-10-09
Frequently asked questions
- What is John Mcmillin's NPI number?
- John Mcmillin's National Provider Identifier (NPI) is 1831432343, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Mcmillin's specialty?
- John Mcmillin is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is John Mcmillin located?
- John Mcmillin's practice location on file with NPPES is 3743 Highland Avenue, Chicago, IL 60673-0001.
- What is John Mcmillin's phone number?
- The practice phone number listed in the NPPES registry for John Mcmillin is (847) 390-5900.
- Does John Mcmillin accept Medicare?
- John Mcmillin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Mcmillin's NPI active?
- Yes — John Mcmillin's NPI (1831432343) is active in the NPPES registry as of the last update on 2025-10-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.