John Marcellus, M.D.
NPI 1972647352 · Psychiatry Physician · Houston, TX
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Marcellus, M.D. is a Psychiatry Physician provider in Houston, TX (NPI 1972647352).
Provider details
- NPI number
- 1972647352
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- J4325 (TX)
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 tenure25% of score
19 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
241 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 | 155 | $122 |
| Psychotherapy With Evaluation and Management Visit, 30 Minutes90833 | 42 | $69 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 25 | $89 |
| Psychotherapy With Evaluation and Management Visit, 45 Minutes90836 | 19 | $79 |
Typical Medicare-allowed amounts for these services range $69–$122 (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 · 53 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Bupropion Hclbrand: Bupropion Xl | 95 | 18 |
| Alprazolam | 71 | 13 |
| Trazodone Hcl | 68 | 13 |
| Sertraline Hcl | 67 | 12 |
| Dextroamphetamine/Amphetaminebrand: Dextroamphetamine-Amphetamine | 64 | 11 |
| Quetiapine Fumarate | 52 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,007 across 97 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
- 2007-02-18
- Last updated
- 2010-07-20
Frequently asked questions
- What is John Marcellus's NPI number?
- John Marcellus's National Provider Identifier (NPI) is 1972647352, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Marcellus's specialty?
- John Marcellus is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is John Marcellus located?
- John Marcellus's practice location on file with NPPES is 4888 Loop Central Dr, Houston, TX 77081-2214.
- What is John Marcellus's phone number?
- The practice phone number listed in the NPPES registry for John Marcellus is (713) 346-1542.
- Does John Marcellus accept Medicare?
- John Marcellus is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Marcellus's NPI active?
- Yes — John Marcellus's NPI (1972647352) is active in the NPPES registry as of the last update on 2010-07-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.