William Chastain, MD
NPI 1891980777 · Hospitalist Physician · Greenville, SC
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Chastain, MD is a Hospitalist Physician provider in Greenville, SC (NPI 1891980777).
Provider details
- NPI number
- 1891980777
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 65091 (GA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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 tenure25% of score
18 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
6 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,030 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 525 | $74 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 236 | $111 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 182 | $76 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 69 | $163 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 18 | $123 |
Typical Medicare-allowed amounts for these services range $74–$163 (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 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 31 | 31 |
| Cefdinir | 24 | 24 |
| Metoprolol Succinate | 17 | 17 |
| Amlodipine Besylate | 14 | 14 |
| Carvedilol | 14 | 14 |
| Apixabanbrand: Eliquis | 13 | 12 |
| Losartan Potassium | 13 | 11 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$57 across 3 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
Additional practice locations (5)
- 227 Mountain DrDahlonega, GA 30533-1606Phone: (770) 219-2627
- 1 Medical Center DrBiddeford, ME 04005-9422Phone: (207) 283-7937Fax: (207) 283-7018
- 22 Bramhall StPortland, ME 04102-3134Phone: (207) 662-4618Fax: (207) 662-6254
- 25 June StSanford, ME 04073-2621Phone: (207) 324-4310
- 612 Mocksville AveSalisbury, NC 28144-2732Phone: (704) 210-5260Fax: (704) 210-5265
Registry dates
- Enumerated
- 2007-09-13
- Last updated
- 2025-08-21
- Certified
- 2025-08-21
Frequently asked questions
- What is William Chastain's NPI number?
- William Chastain's National Provider Identifier (NPI) is 1891980777, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Chastain's specialty?
- William Chastain is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is William Chastain located?
- William Chastain's practice location on file with NPPES is 701 Grove Rd Fl 5, Greenville, SC 29605-4210.
- What is William Chastain's phone number?
- The practice phone number listed in the NPPES registry for William Chastain is (864) 455-4411.
- Does William Chastain accept Medicare?
- William Chastain is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Chastain's NPI active?
- Yes — William Chastain's NPI (1891980777) is active in the NPPES registry as of the last update on 2025-08-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.