2026 NPPES data Psychiatry Physician NPI 1639532534 D.O.
Verify on CMS →

CHELSEA ATWATER, D.O.

Psychiatry Physician in LEXINGTON, Kentucky. 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
261
Medicare Part D claims · 50 beneficiaries · Psychiatry Physician avg: 1K
Generic prescribing
93%
generic claims · 7% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
100/100
▲ 17 pts above national avg 83.1 · [object Object]

What the federal data shows

CHELSEA ATWATER, D.O. reported a CMS MIPS final score of 100/100 — above the 83.1 national average — and filed 261 Medicare Part D claims in 2023.

100/100
MIPS score · +17 vs avg
261
Part D claims, 2023
93%
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.

CHELSEA ATWATER, D.O.'s MIPS score vs every scored U.S. clinician

CMS Merit-based Incentive Payment System (MIPS) final score, 2023 — the federal quality measure

100 Top 7% higher than 93% of 477,587 scored providers

0–10: 8,684 scored providers (2%). Below this entry. 10–20: 3,008 scored providers (1%). Below this entry. 20–30: 3,069 scored providers (1%). Below this entry. 30–40: 2,746 scored providers (1%). Below this entry. 40–50: 2,928 scored providers (1%). Below this entry. 50–60: 5,882 scored providers (1%). Below this entry. 60–70: 13,906 scored providers (3%). Below this entry. 70–80: 118,074 scored providers (25%). Below this entry. 80–90: 129,887 scored providers (27%). Below this entry. 90–100: 189,403 scored providers (40%). This entry sits in this band. This provider 0 100 every MIPS-scored clinician, bucketed by value

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

Board certification likely (heuristic — not verified)

CHELSEA ATWATER, D.O. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 2 hospital affiliations — 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 CHELSEA ATWATER, D.O.?

High performer (top quartile)

NPI registry status

Active

Issued 03/30/2016

NPI 1639532534

Primary specialty

Psychiatry Physician

High-volume

53,104 US NPIs in this specialty

Medicare Part D claims

261 75% vs specialty avg

2023 prescription claims

Specialty avg: 1,038

MIPS final score

100/100 16.900000000000006% pts

Exceptional band

vs 83.1 national avg

Specialty distribution in Kentucky

How Psychiatry Physician compares to other specialties among Kentucky providers

Kentucky providers

Psychiatry Physician share within Kentucky

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

Medicare quality performance — MIPS

CHELSEA ATWATER, D.O.'s 2023 MIPS final score plotted against the Psychiatry Physician national average

High performer (top quartile)
MIPS Final Score
100/100
vs 83.1 national avg · 2023 performance year

MIPS final score (Psychiatry Physician) — 100/100 vs national avg 83.1

0%100%National avg83%99%
MIPS final score (Psychiatry Physician) — 100/100 vs national avg 83.1

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).

CHELSEA ATWATER, D.O. appears in the CMS NPPES registry as a Psychiatry Physician provider holding D.O. credentials at 1350 BULL LEA RD, LEXINGTON, KY, 40511, with a listed phone of (859) 246-8000. NPI 1639532534 was issued on 03/30/2016. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what ATWATER 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 261 prescription claims written by this provider, covering 50 Medicare beneficiaries and totaling roughly $22K in drug spend, split 7% brand-name and 93% generic by claim count. 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. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 100/100 for the 2023 performance year, compared with the national average of 83.1.

Psychiatry Physician is a high-volume specialty nationwide, with 53,104 enrolled providers across 56 states and an average of 1,038 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

1350 BULL LEA RD
LEXINGTON, KY 40511

Provider Details

NPI 1639532534
Specialty Psychiatry Physician
Credentials D.O.
Gender Female
NPI Issued 03/30/2016

CMS Quality Score (MIPS)

Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.

100
Final Score
Avg: 83.1
100
Promoting Interoperability

Reporting: Group practice

Hospital and facility affiliations

Facilities where CHELSEA ATWATER, D.O. 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.

COMMONWEALTH OF KENTUCKY
LEXINGTON, KY
KENTUCKY MEDICAL SERVICES FOUNDATION, INC
LEXINGTON, KY

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 · Generic-heavy

CHELSEA ATWATER, D.O. — brand share 7.0%
Specialty average (est.)

7% brand-name claims vs 93% generic, on 261 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.

261
Total Claims
$22K
Total Drug Cost
50
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
266
Total Day Supply
7,043
Brand vs Generic
7% brand / 93% generic
Brand Drug Cost
$14K
Generic Drug Cost
$8K

Patient Demographics

Average Patient Age
46.1 years
Avg HCC Risk Score
1.13
Gender Split
60% female / 40% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

What CHELSEA ATWATER, D.O. prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Divalproex Sodium
30
Olanzapine
25
Risperidone
18
Metformin Hcl
14
Omeprazole
12

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Psychiatry Physician Overview

How CHELSEA ATWATER, D.O. fits within the Psychiatry Physician landscape nationally.

53,104
Psychiatry Physician Providers in US
56
States with Psychiatry Physician
1,038
Avg Claims per Provider

CHELSEA ATWATER, D.O.'s 261 claims are below the specialty average of 1,038.

Nearby Psychiatry Physician Providers in Kentucky

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

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

Frequently Asked Questions

What is CHELSEA ATWATER, D.O.'s specialty?
CHELSEA ATWATER, D.O. specializes in Psychiatry Physician and practices in LEXINGTON, Kentucky. Credentials: D.O..
How much does CHELSEA ATWATER, D.O. prescribe under Medicare Part D?
In 2023, CHELSEA ATWATER, D.O. wrote 261 Medicare Part D claims totaling $22K in drug costs for 50 beneficiaries.
What is CHELSEA ATWATER, D.O.'s Medicare quality score?
CHELSEA ATWATER, D.O. has a CMS MIPS Final Score of 100/100. The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is CHELSEA ATWATER, D.O. located?
CHELSEA ATWATER, D.O. is located at 1350 BULL LEA RD, LEXINGTON, KY, 40511. Phone: (859) 246-8000.
What is CHELSEA ATWATER, D.O.'s NPI number?
CHELSEA ATWATER, D.O.'s National Provider Identifier (NPI) is 1639532534, issued on 03/30/2016.
Does CHELSEA ATWATER, D.O. prescribe more brand-name or generic drugs?
CHELSEA ATWATER, D.O.'s prescribing is 7% brand-name and 93% generic drugs by claim count, with $14K in brand drug costs.
How many Psychiatry Physician providers are there in the US?
There are 53,104 Psychiatry Physician providers across 56 states in the US. The average Psychiatry Physician provider writes 1,038 Medicare Part D claims per year.
What drugs does CHELSEA ATWATER, D.O. prescribe most often?
Based on 2023 Medicare Part D data, CHELSEA ATWATER, D.O.'s most frequently prescribed drugs include Divalproex Sodium, Olanzapine, Risperidone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does CHELSEA ATWATER, D.O. accept Medicare?
CHELSEA ATWATER, D.O. appears in CMS Medicare data with 261 Part D claims and 50 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify CHELSEA ATWATER, D.O.'s credentials?
CHELSEA ATWATER, D.O.'s NPI is 1639532534 with credentials D.O.. 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.
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