Donald Slack, M.D.
NPI 1790005981 · Pulmonary Disease Physician · Towson, MD
Enrolled with Medicare as Practitioner - Critical Care (intensivists) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Donald Slack, M.D. is a Pulmonary Disease Physician provider in Towson, MD (NPI 1790005981).
Provider details
- NPI number
- 1790005981
- Entity type
- Individual
- Primary specialty
- Pulmonary Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- D0080447 (MD)
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
16 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
461 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 | 241 | $215 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 106 | $79 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 73 | $121 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 17 | $133 |
| Emergent Insertion of Breathing Tube Into Windpipe Using an Endoscope31500 | 12 | $144 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 12 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Fluticasone/Umeclidin/Vilanterbrand: Trelegy Ellipta | 25 |
| Mepolizumabbrand: Nucala | 12 |
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 no Part D record, 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
- 2010-06-10
- Last updated
- 2018-06-20
Frequently asked questions
- What is Donald Slack's NPI number?
- Donald Slack's National Provider Identifier (NPI) is 1790005981, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Donald Slack's specialty?
- Donald Slack is listed in the NPPES registry with a primary specialty of Pulmonary Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Donald Slack located?
- Donald Slack's practice location on file with NPPES is 6565 North Charles St., Towson, MD 21204.
- What is Donald Slack's phone number?
- The practice phone number listed in the NPPES registry for Donald Slack is (443) 849-3901.
- Does Donald Slack accept Medicare?
- Donald Slack is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Donald Slack's NPI active?
- Yes — Donald Slack's NPI (1790005981) is active in the NPPES registry as of the last update on 2018-06-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.