Charles King, M.D.
NPI 1558399436 · Gastroenterology Physician · Annapolis, MD
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charles King, M.D. is a Gastroenterology Physician provider in Annapolis, MD (NPI 1558399436).
Provider details
- NPI number
- 1558399436
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- D0041618 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
231 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 115 | $132 |
| Removal of External Hemorrhoids By Rubber Banding46221 | 43 | $299 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 29 | $95 |
| Diagnostic Exam of Anus Using an Endoscope46600 | 26 | $125 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 18 | $59 |
Typical Medicare-allowed amounts for these services range $59–$299 (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 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Famotidine | 249 | 73 |
| Pantoprazole Sodium | 135 | 33 |
| Ursodiol | 77 | 20 |
| Omeprazole | 58 | 20 |
| Mesalaminebrand: Mesalamine Er | 56 | 14 |
| Sucralfate | 26 | 13 |
| Lipase/Protease/Amylasebrand: Creon | 21 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,055 across 53 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
Registry dates
- Enumerated
- 2006-06-29
- Last updated
- 2015-02-19
Frequently asked questions
- What is Charles King's NPI number?
- Charles King's National Provider Identifier (NPI) is 1558399436, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charles King's specialty?
- Charles King is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Charles King located?
- Charles King's practice location on file with NPPES is 621 Ridgely Ave, Annapolis, MD 21401-1081.
- What is Charles King's phone number?
- The practice phone number listed in the NPPES registry for Charles King is (410) 224-4887.
- Does Charles King accept Medicare?
- Charles King is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charles King's NPI active?
- Yes — Charles King's NPI (1558399436) is active in the NPPES registry as of the last update on 2015-02-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.