NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1336522028 M.D.
Verify on CMS → Marisela Gonzalez Mercado, M.D.
Internal Medicine Physician in Tulsa, Oklahoma.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 174,792 in Internal Medicine Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
336
Medicare Part D claims · 123 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
88%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Marisela Gonzalez Mercado, M.D. filed 336 Medicare Part D claims in 2024 as an Internal Medicine Physician in Tulsa, Oklahoma, prescribing 88% generic.
- 336
- Part D claims, 2024
- 88%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥56th
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Marisela Gonzalez Mercado, M.D.
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1336522028), first enumerated 06/30/2015.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 336 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1336522028 · Internal Medicine Physician
NPI-10 · ENUM-MID · TAX-MEGA · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1336522028
- ENUM-MID 2015
- TAX-MEGA 175K Internal Medicine
- RX-LIGHT 336
- BOOK-LIGHT 1,347 in Oklahoma
- PHOTO-ENUM Khurram Khan · 2015
Marisela Gonzalez Mercado, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
336 ≥ 56th percentile 56% of 1,416,883 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
✓
Board certification likely (heuristic, not verified)
Marisela Gonzalez Mercado, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Marisela Gonzalez Mercado, M.D.?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
336 88% vs specialty avg
Specialty distribution in Oklahoma
How Internal Medicine Physician compares to other specialties among Oklahoma providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Internal Medicine Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1336522028 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 06/30/2015 |
Hospital and facility affiliations
Facilities where Marisela Gonzalez Mercado, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Gulf Coast Physician Services, PLLC
Kingsville, TX
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Typical
Marisela Gonzalez Mercado, M.D. - brand share 12.0%
Internal Medicine Physician average
12% brand-name claims vs 88% generic, on 336 2024 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
336
Total Claims
$18K
Total Drug Cost
123
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 527.467
- Total Day Supply
- 13,086
- Brand vs Generic
- 12% brand / 88% generic
- Brand Drug Cost
- $14K
- Generic Drug Cost
- $4K
- Opioid Claims
- 25 (7.4% rate)
- Antibiotic Claims
- 47
Patient Demographics
- Average Patient Age
- 73.3 years
- Avg HCC Risk Score
- 3.11
- Gender Split
- 41% female / 59% male
- Age Distribution
- <65: 17, 65-74: 51, 75-84: 39, 85+: 16
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Marisela Gonzalez Mercado, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Atorvastatin Calcium
Atorvastatin Calcium
27 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
20 claims
- Clopidogrel
Clopidogrel
17 claims
- Furosemide
Furosemide
15 claims
- Lisinopril
Lisinopril
15 claims
- Eliquis
Eliquis
12 claims
- Pantoprazole Sodium
Pantoprazole Sodium
12 claims
- Doxycycline Hyclate
Doxycycline Hyclate
11 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 27 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 20 |
| Clopidogrel Clopidogrel Bisulfate | 17 |
| Furosemide | 15 |
| Lisinopril | 15 |
| Eliquis Apixaban | 12 |
| Pantoprazole Sodium | 12 |
| Doxycycline Hyclate | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Internal Medicine Physician Overview
How Marisela Gonzalez Mercado, M.D. fits within the Internal Medicine Physician landscape nationally.
174,792
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,785
Avg Claims per Provider
Marisela Gonzalez Mercado, M.D.'s 336 claims are below the specialty average of 2,785.
Nationwide Internal Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Gonzalez Mercado, both outside Oklahoma so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2015)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Internal Medicine Physician Providers in Oklahoma
Other clinicians with the same primary specialty enrolled in Oklahoma, drawn from the same CMS NPPES roster as Gonzalez Mercado.
One of 1,347 Internal Medicine Physician providers enrolled in Oklahoma, 5 are shown here.
Abdelrahman Abdalla
Oklahoma City, OK
Dr. Al-Ola Abdallah
M.D
Tulsa, OK
Dr. Tony Abdo
M.D
Oklahoma City, OK
Dr. David Abernethy
M.D.
Oklahoma City, OK
Dr. Ahmed Abou Elmagd
MD
Fort Sill, OK
Compare Internal Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Marisela Gonzalez Mercado, M.D.'s specialty? ▼
Marisela Gonzalez Mercado, M.D. specializes in Internal Medicine Physician and practices in Tulsa, Oklahoma. Credentials: M.D..
How much does Marisela Gonzalez Mercado, M.D. prescribe under Medicare Part D? ▼
In 2024, Marisela Gonzalez Mercado, M.D. wrote 336 Medicare Part D claims totaling $18K in drug costs for 123 beneficiaries.
Where is Marisela Gonzalez Mercado, M.D. located? ▼
Marisela Gonzalez Mercado, M.D. is located at 6161 S YALE AVE, Tulsa, OK, 74136. Phone: (918) 502-1900.
What is Marisela Gonzalez Mercado, M.D.'s NPI number? ▼
Marisela Gonzalez Mercado, M.D.'s National Provider Identifier (NPI) is 1336522028, issued on 06/30/2015.
Does Marisela Gonzalez Mercado, M.D. prescribe more brand-name or generic drugs? ▼
Marisela Gonzalez Mercado, M.D.'s prescribing is 12% brand-name and 88% generic drugs by claim count, with $14K in brand drug costs.
Does Marisela Gonzalez Mercado, M.D. prescribe opioids? ▼
Yes, Marisela Gonzalez Mercado, M.D. had 25 opioid claims in 2024 with an opioid prescribing rate of 7.4%.
How many Internal Medicine Physician providers are there in the US? ▼
There are 174,792 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,785 Medicare Part D claims per year.
What drugs does Marisela Gonzalez Mercado, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Marisela Gonzalez Mercado, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Hydrocodone-Acetaminophen, Clopidogrel. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Marisela Gonzalez Mercado, M.D. accept Medicare? ▼
Marisela Gonzalez Mercado, M.D. appears in CMS Medicare data with 336 Part D claims and 123 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Marisela Gonzalez Mercado, M.D.'s credentials? ▼
Marisela Gonzalez Mercado, M.D.'s NPI is 1336522028 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.