Walter Gray, MD
NPI 1821040353 · Critical Care Medicine (Internal Medicine) Physician · Indianapolis, IN
Enrolled with Medicare as Practitioner - Critical Care (intensivists) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Walter Gray, MD is a Critical Care Medicine (Internal Medicine) Physician provider in Indianapolis, IN (NPI 1821040353).
Provider details
- NPI number
- 1821040353
- Entity type
- Individual
- Primary specialty
- Critical Care Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- ME43081 (FL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
173 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) |
|---|---|---|
| Critical Care, First 30-74 Minutes99291 | 91 | $201 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 46 | $114 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 36 | $76 |
Typical Medicare-allowed amounts for these services range $76–$201 (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.
Practice location
Mailing address
Additional practice locations (3)
- 9400 Turkey Lake RdOrlando, FL 32819-8001Phone: (407) 354-1202Fax: (407) 351-8801
- 4420 Lake Boone TrlRaleigh, NC 27607-7505Phone: (919) 784-3100
- 3100 Maccorkle Ave Se Ste 816Charleston, WV 25304-1223Phone: (304) 388-2303
Registry dates
- Enumerated
- 2006-05-16
- Last updated
- 2023-09-27
- Certified
- 2023-09-27
Frequently asked questions
- What is Walter Gray's NPI number?
- Walter Gray's National Provider Identifier (NPI) is 1821040353, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Walter Gray's specialty?
- Walter Gray is listed in the NPPES registry with a primary specialty of Critical Care Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Walter Gray located?
- Walter Gray's practice location on file with NPPES is 1701 Senate Blvd, Indianapolis, IN 46202-1239.
- What is Walter Gray's phone number?
- The practice phone number listed in the NPPES registry for Walter Gray is (317) 962-5820.
- Does Walter Gray accept Medicare?
- Walter Gray is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Walter Gray's NPI active?
- Yes — Walter Gray's NPI (1821040353) is active in the NPPES registry as of the last update on 2023-09-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.