2026 NPPES data Epilepsy Physician NPI 1639632854 MD
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ZACHARY MILLS, MD

Epilepsy Physician in CHATTANOOGA, Tennessee. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
25
Medicare Part D claims · Epilepsy Physician avg: 878
What the federal data reveals: ZACHARY MILLS, MD is a Epilepsy Physician ([object Object]) practicing in CHATTANOOGA, Tennessee with a Medicare Part D prescribing footprint of 25 claims .

What stands out: ZACHARY MILLS, MD filed 25 Medicare Part D claims in 2023 across CHATTANOOGA, Tennessee. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board certification likely (heuristic — not verified)

ZACHARY MILLS, MD 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).

ZACHARY MILLS, MD at a glance

Quality data not reported

NPI registry status

Active

Issued 04/14/2019

NPI 1639632854

Primary specialty

Epilepsy Physician

Rare

354 US NPIs in this specialty

Medicare Part D claims

25 97% vs specialty avg

2023 prescription claims

Specialty avg: 878

Specialty distribution in Tennessee

How Epilepsy Physician compares to other specialties among Tennessee providers

Tennessee providers

Epilepsy Physician share within Tennessee

1. Epilepsy Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Epilepsy Physician share within Tennessee

Specialty board-certification context

Estimated specialty board-certified rate — Epilepsy Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Epilepsy Physician ABMS/AOA estimate

Est. board-certified rate (Epilepsy Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Epilepsy Physician) — ABMS / AOA estimate

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).

ZACHARY MILLS, MD is a Epilepsy Physician provider practicing in CHATTANOOGA, Tennessee, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: MD. NPI: 1639632854. This profile includes practice location, specialty classification, and organizational affiliations from the CMS provider registry. Provider information is self-reported to CMS and updated monthly.

ZACHARY MILLS, MD appears in the CMS NPPES registry as a Epilepsy Physician provider holding MD credentials at 979 E 3RD ST STE C830, CHATTANOOGA, TN, 37403, with a listed phone of (423) 778-6879. NPI 1639632854 was issued on 04/14/2019. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what MILLS most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 25 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $6K in drug spend. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Epilepsy Physician is a narrow specialty nationwide, with 354 enrolled providers across 42 states and an average of 878 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

979 E 3RD ST STE C830
CHATTANOOGA, TN 37403

Provider Details

NPI 1639632854
Specialty Epilepsy Physician
Credentials MD
Gender Male
NPI Issued 04/14/2019

Hospital and facility affiliations

Facilities where ZACHARY MILLS, MD 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.

ERLANGER HEALTH
SIGNAL MOUNTAIN, TN

Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2023.

25
Total Claims
$6K
Total Drug Cost
N/A
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
38
Total Day Supply
1,114
Generic Drug Cost
$753

Patient Demographics

Average Patient Age
63.4 years
Avg HCC Risk Score
1.16

Epilepsy Physician Overview

How ZACHARY MILLS, MD fits within the Epilepsy Physician landscape nationally.

354
Epilepsy Physician Providers in US
42
States with Epilepsy Physician
878
Avg Claims per Provider

ZACHARY MILLS, MD's 25 claims are below the specialty average of 878.

Nearby Epilepsy Physician Providers in Tennessee

Other clinicians with the same primary specialty enrolled in Tennessee, drawn from the same CMS NPPES roster as MILLS.

Compare Epilepsy Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is ZACHARY MILLS, MD's specialty?
ZACHARY MILLS, MD specializes in Epilepsy Physician and practices in CHATTANOOGA, Tennessee. Credentials: MD.
How much does ZACHARY MILLS, MD prescribe under Medicare Part D?
In 2023, ZACHARY MILLS, MD wrote 25 Medicare Part D claims totaling $6K in drug costs for N/A beneficiaries.
Where is ZACHARY MILLS, MD located?
ZACHARY MILLS, MD is located at 979 E 3RD ST STE C830, CHATTANOOGA, TN, 37403. Phone: (423) 778-6879.
What is ZACHARY MILLS, MD's NPI number?
ZACHARY MILLS, MD's National Provider Identifier (NPI) is 1639632854, issued on 04/14/2019.
How many Epilepsy Physician providers are there in the US?
There are 354 Epilepsy Physician providers across 42 states in the US. The average Epilepsy Physician provider writes 878 Medicare Part D claims per year.
Does ZACHARY MILLS, MD accept Medicare?
ZACHARY MILLS, MD appears in CMS Medicare data with 25 Part D claims and N/A Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify ZACHARY MILLS, MD's credentials?
ZACHARY MILLS, MD's NPI is 1639632854 with credentials MD. 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

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.
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