NPI registry status
Active
2026 NPPES data Obstetrics Physician NPI 1699798884 M.D.
Verify on CMS → Robert Tatum, M.D.
Obstetrics Physician in Knoxville, Tennessee.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 1,396 in Obstetrics 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
356
Medicare Part D claims · 94 beneficiaries · Obstetrics Physician avg: 319
Generic prescribing
88%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
89.6/100
▲ 7 pts above national avg 83.1 · Exceptional
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Robert Tatum, M.D. reported a CMS MIPS final score of 89.6/100 - above the 83.1 national average - and filed 356 Medicare Part D claims in 2023.
- 89.6/100
- MIPS score · +7 vs avg
- 356
- Part D claims, 2023
- 88%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Robert Tatum, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
90 Top 42% higher than 58% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. 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.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Robert Tatum, M.D. sits
This provider among obstetrics physician peers
Across the 243 obstetrics physician providers who report both Medicare Part D prescribing and a MIPS quality score, Robert Tatum, M.D. writes more Part D claims than 83% of them and scores higher on MIPS quality than 55% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one obstetrics physician peer from a representative sample of 60; the gold marker is Robert Tatum, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Robert Tatum, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 Robert Tatum, M.D.?
High performer (top quartile)Primary specialty
Obstetrics Physician
Medicare Part D claims
356 12% vs specialty avg
MIPS final score
89.6/100 6.5 pts vs avg
Specialty distribution in Tennessee
How Obstetrics Physician compares to other specialties among Tennessee providers
Medicare quality performance, MIPS
Robert Tatum, M.D.'s 2023 MIPS final score plotted against the Obstetrics Physician national average
- MIPS Final Score
- 89.6/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Obstetrics Physician) - 89.6/100 vs national avg 83.1
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).
Robert Tatum, M.D. appears in the CMS NPPES registry as an Obstetrics Physician provider holding M.D. credentials at 10810 PARKSIDE DR STE 100, Knoxville, TN, 37934, with a listed phone of (865) 218-6660. NPI 1699798884 was issued on 07/26/2006.
Medicare Part D records for calendar year 2023 show 356 prescription claims written by this provider, covering 94 Medicare beneficiaries and totaling roughly $33K in drug spend, split 12% brand-name and 88% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 89.6/100 for the 2023 performance year (Quality 77.7), compared with the national average of 83.1.
Obstetrics Physician is a narrow specialty nationwide, with 1,396 enrolled providers across 54 states and an average of 319 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1699798884 |
|---|---|
| Specialty | Obstetrics Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 07/26/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
89.6389
Final Score
Avg: 83.1
77.663
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
Brand vs generic prescribing mix · Typical
Robert Tatum, M.D. - brand share 12.0%
Obstetrics Physician average
12% brand-name claims vs 88% generic, on 356 2023 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 2023.
356
Total Claims
$33K
Total Drug Cost
94
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 859
- Total Day Supply
- 25,039
- Brand vs Generic
- 12% brand / 88% generic
- Brand Drug Cost
- $25K
- Generic Drug Cost
- $9K
Patient Demographics
- Average Patient Age
- 68.5 years
- Avg HCC Risk Score
- 0.91
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Robert Tatum, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Estradiol
Estradiol
176 claims
- Medroxyprogesteron… 35
Medroxyprogesterone Acetate
35 claims
- Valacyclovir 16
Valacyclovir
16 claims
- Elmiron 15
Elmiron
15 claims
- Fluconazole 12
Fluconazole
12 claims
- Triamcinolone Acet… 11
Triamcinolone Acetonide
11 claims
| Drug | Claims |
|---|---|
| Estradiol | 176 |
| Medroxyprogesterone Acetate | 35 |
| Valacyclovir Valacyclovir Hcl | 16 |
| Elmiron Pentosan Polysulfate Sodium | 15 |
| Fluconazole | 12 |
| Triamcinolone Acetonide | 11 |
| Progesterone "Progesterone | N/A |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Obstetrics Physician Overview
How Robert Tatum, M.D. fits within the Obstetrics Physician landscape nationally.
1,396
Obstetrics Physician Providers in US
54
States with Obstetrics Physician
319
Avg Claims per Provider
Robert Tatum, M.D.'s 356 claims are above the specialty average of 319.
Nearby Obstetrics Physician Providers in Tennessee
Other clinicians with the same primary specialty enrolled in Tennessee, drawn from the same CMS NPPES roster as Tatum.
Dr. John Adams
MD
Chattanooga, TN
Dr. Olukayode Akinlaja
M.D.
Chattanooga, TN
Dr. Stephanie Dallas
M.D.
Nashville, TN
Dr. Tessa Eckhardt
NP
Ooltewah, TN
Dr. Lauren Faulkner
NP
Memphis, TN
Compare Obstetrics Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Tennessee medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Obstetrics Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Robert Tatum, M.D.'s specialty? ▼
Robert Tatum, M.D. specializes in Obstetrics Physician and practices in Knoxville, Tennessee. Credentials: M.D..
How much does Robert Tatum, M.D. prescribe under Medicare Part D? ▼
In 2023, Robert Tatum, M.D. wrote 356 Medicare Part D claims totaling $33K in drug costs for 94 beneficiaries.
What is Robert Tatum, M.D.'s Medicare quality score? ▼
Robert Tatum, M.D. has a CMS MIPS Final Score of 89.6/100 (Quality: 77.7). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Robert Tatum, M.D. located? ▼
Robert Tatum, M.D. is located at 10810 PARKSIDE DR STE 100, Knoxville, TN, 37934. Phone: (865) 218-6660.
What is Robert Tatum, M.D.'s NPI number? ▼
Robert Tatum, M.D.'s National Provider Identifier (NPI) is 1699798884, issued on 07/26/2006.
Does Robert Tatum, M.D. prescribe more brand-name or generic drugs? ▼
Robert Tatum, M.D.'s prescribing is 12% brand-name and 88% generic drugs by claim count, with $25K in brand drug costs.
How many Obstetrics Physician providers are there in the US? ▼
There are 1,396 Obstetrics Physician providers across 54 states in the US. The average Obstetrics Physician provider writes 319 Medicare Part D claims per year.
What drugs does Robert Tatum, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Robert Tatum, M.D.'s most frequently prescribed drugs include Estradiol, Medroxyprogesterone Acetate, Valacyclovir. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Robert Tatum, M.D. accept Medicare? ▼
Robert Tatum, M.D. appears in CMS Medicare data with 356 Part D claims and 94 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Robert Tatum, M.D.'s credentials? ▼
Robert Tatum, M.D.'s NPI is 1699798884 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 (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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 April 2026 (NPPES) / 2023 (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
Compiled from official public sources by the PlainDoctor editorial team.
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 May 2026.