Michael Gnatt, MD
NPI 1255392866 · Internal Medicine Physician · Rockville, MD
Michael Gnatt, MD is a Internal Medicine Physician provider in Rockville, MD (NPI 1255392866).
Provider details
- NPI number
- 1255392866
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 204857 (NY)
Specialties & taxonomies
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
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
262 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 | 139 | $141 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 95 | $9 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 16 | $199 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 12 | $16 |
Typical Medicare-allowed amounts for these services range $9–$199 (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 · 32 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 91 | 28 |
| Levothyroxine Sodium | 60 | 14 |
| Losartan Potassium | 40 | — |
| Amlodipine Besylate | 40 | 15 |
| Famotidine | 33 | 13 |
| Rosuvastatin Calcium | 31 | 12 |
| Montelukast Sodium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-03-31
- Last updated
- 2013-05-09
Frequently asked questions
- What is Michael Gnatt's NPI number?
- Michael Gnatt's National Provider Identifier (NPI) is 1255392866, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Gnatt's specialty?
- Michael Gnatt is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Gnatt located?
- Michael Gnatt's practice location on file with NPPES is 14955 Shady Grove Rd, Rockville, MD 20850-8700.
- What is Michael Gnatt's phone number?
- The practice phone number listed in the NPPES registry for Michael Gnatt is (301) 990-3193.
- Is Michael Gnatt's NPI active?
- Yes — Michael Gnatt's NPI (1255392866) is active in the NPPES registry as of the last update on 2013-05-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.