Robert Chambers, M.D.
NPI 1871540864 · Psychiatry Physician · Indianapolis, IN
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert Chambers, M.D. is a Psychiatry Physician provider in Indianapolis, IN (NPI 1871540864).
Provider details
- NPI number
- 1871540864
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 01058086A (IN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Gabapentin | 22 |
| Buprenorphine Hcl/Naloxone Hclbrand: Buprenorphine-Naloxone | 21 |
| Venlafaxine Hclbrand: Venlafaxine Hcl Er | 17 |
| Naltrexone Hcl | 16 |
| Bupropion Hclbrand: Bupropion Xl | 15 |
| Amitriptyline Hcl | 15 |
| Olanzapine | 14 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-27
- Last updated
- 2026-03-31
- Certified
- 2026-03-31
Frequently asked questions
- What is Robert Chambers's NPI number?
- Robert Chambers's National Provider Identifier (NPI) is 1871540864, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Chambers's specialty?
- Robert Chambers is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Chambers located?
- Robert Chambers's practice location on file with NPPES is 2506 Willowbrook Pkwy Ste 300, Indianapolis, IN 46205-1500.
- What is Robert Chambers's phone number?
- The practice phone number listed in the NPPES registry for Robert Chambers is (317) 574-1254.
- Does Robert Chambers accept Medicare?
- Robert Chambers is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert Chambers's NPI active?
- Yes — Robert Chambers's NPI (1871540864) is active in the NPPES registry as of the last update on 2026-03-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.