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2026 NPPES data Colon & Rectal Surgery Physician NPI 1164461505 M.D.
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Patrick Hammen, M.D.

Colon & Rectal Surgery Physician in Smyrna, Georgia.

This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 1,642 in Colon & Rectal Surgery 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
253
Medicare Part D claims · 161 beneficiaries · Colon & Rectal Surgery Physician avg: 210
Generic prescribing
89%
generic claims · 11% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
92.9/100
▲ 9 pts above national avg 83.5 · Exceptional
Industry payments
$219.93
2 payments · CMS Open Payments (Sunshine Act)
Verify NPI on CMS Methodology
Compiled from official public sources by the editorial process.

What the federal data shows

Patrick Hammen, M.D. reported a CMS MIPS final score of 92.9/100 - above the 83.5 national average - and filed 253 Medicare Part D claims in 2024.

92.9/100
MIPS score · +9 vs avg
253
Part D claims, 2024
89%
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.

Federal trust snapshot

What official records show about Patrick Hammen, M.D.

Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.

  • Verified

    NPI registry status

    Active listing in the CMS National Provider Identifier Registry (NPI 1164461505), first enumerated 06/04/2006.

    Source: CMS NPPES

  • Reported

    Medicare Part D participation

    Filed 253 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.

    Source: CMS Part D Prescriber PUF

  • Reported

    CMS quality reporting (MIPS)

    Reported a CMS MIPS final score of 92.9/100 in the Quality Payment Program — a federal quality measure, not a patient review.

    Source: CMS Quality Payment Program

  • 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.

    Source: NUCC taxonomy + CMS participation heuristic

  • Reported

    Hospital affiliations

    1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.

    Source: CMS Care Compare

  • Reported

    Industry payment transparency

    $219.93 in reported industry payments (2 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.

    Source: CMS Open Payments

  • 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 1164461505 · Colon & Rectal Surgery Physician

NPI-10 · ENUM-LEGACY · TAX-NARROW · MIPS-ABOVE · RX-LIGHT · BOOK-THIN · PHOTO-FINISH

  • NPI-10 1164461505
  • ENUM-LEGACY 2006
  • TAX-NARROW 1,642
  • MIPS-ABOVE 92.9/100
  • RX-LIGHT 253
  • BOOK-THIN 56 in Georgia
  • PHOTO-FINISH Harry Reynolds · ±0.0

MIPS final-score neighbourhood

Same-specialty nationwide peers by CMS final score, not geographic proximity

MIPS pts

What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).

Source CMS Quality Payment Program (MIPS) As of 2023

Patrick Hammen, M.D.'s MIPS score vs every measured U.S. clinician

CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.

93 ≥ 66th percentile 66% of 454,083 measured providers are in lower value bands

0–10: 8,684 measured providers (2%). Below this entry. 10–20: 3,008 measured providers (1%). Below this entry. 20–30: 3,069 measured providers (1%). Below this entry. 30–40: 2,746 measured providers (1%). Below this entry. 40–50: 2,928 measured providers (1%). Below this entry. 50–60: 5,882 measured providers (1%). Below this entry. 60–70: 13,906 measured providers (3%). Below this entry. 70–80: 94,570 measured providers (21%). Below this entry. 80–90: 129,887 measured providers (29%). Below this entry. 90+: 189,403 measured providers (42%). This entry sits in this band. This provider 0 100 every measured MIPS clinician, bucketed by value

Each bar is a band; taller bars hold more measured 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.

The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.

Source CMS Merit-based Incentive Payment System (MIPS) · 2023

Where Patrick Hammen, M.D. sits

This provider among colon & rectal surgery physician peers

Across the 511 colon & rectal surgery physician providers who report both Medicare Part D prescribing and a MIPS quality score, Patrick Hammen, M.D. writes more Part D claims than 71% of them and scores higher on MIPS quality than 71% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.

Lower volume · High qualityHigh volume · High qualityLower volume · Lower qualityHigh volume · Lower quality02550751000255075100Part D claim volume, percentile in specialtyMIPS quality, percentilePoint, Part D claim volume, percentile in specialty: 72 · MIPS quality, percentile: 20Point, Part D claim volume, percentile in specialty: 55 · MIPS quality, percentile: 85Point, Part D claim volume, percentile in specialty: 75 · MIPS quality, percentile: 10Point, Part D claim volume, percentile in specialty: 43 · MIPS quality, percentile: 95Point, Part D claim volume, percentile in specialty: 22 · MIPS quality, percentile: 2Point, Part D claim volume, percentile in specialty: 17 · MIPS quality, percentile: 12Point, Part D claim volume, percentile in specialty: 18 · MIPS quality, percentile: 22Point, Part D claim volume, percentile in specialty: 0 · MIPS quality, percentile: 73Point, Part D claim volume, percentile in specialty: 93 · MIPS quality, percentile: 5Point, Part D claim volume, percentile in specialty: 57 · MIPS quality, percentile: 30Point, Part D claim volume, percentile in specialty: 33 · MIPS quality, percentile: 25Point, Part D claim volume, percentile in specialty: 85 · MIPS quality, percentile: 88Point, Part D claim volume, percentile in specialty: 60 · MIPS quality, percentile: 87Point, Part D claim volume, percentile in specialty: 95 · MIPS quality, percentile: 43Point, Part D claim volume, percentile in specialty: 40 · MIPS quality, percentile: 93Point, Part D claim volume, percentile in specialty: 68 · MIPS quality, percentile: 33Point, Part D claim volume, percentile in specialty: 83 · MIPS quality, percentile: 40Point, Part D claim volume, percentile in specialty: 37 · MIPS quality, percentile: 73Point, Part D claim volume, percentile in specialty: 13 · MIPS quality, percentile: 82Point, Part D claim volume, percentile in specialty: 8 · MIPS quality, percentile: 7Point, Part D claim volume, percentile in specialty: 92 · MIPS quality, percentile: 67Point, Part D claim volume, percentile in specialty: 12 · MIPS quality, percentile: 83Point, Part D claim volume, percentile in specialty: 73 · MIPS quality, percentile: 28Point, Part D claim volume, percentile in specialty: 28 · MIPS quality, percentile: 80Point, Part D claim volume, percentile in specialty: 0 · MIPS quality, percentile: 47Point, Part D claim volume, percentile in specialty: 70 · MIPS quality, percentile: 50Point, Part D claim volume, percentile in specialty: 10 · MIPS quality, percentile: 52Point, Part D claim volume, percentile in specialty: 53 · MIPS quality, percentile: 0Point, Part D claim volume, percentile in specialty: 88 · MIPS quality, percentile: 45Point, Part D claim volume, percentile in specialty: 100 · MIPS quality, percentile: 48Point, Part D claim volume, percentile in specialty: 15 · MIPS quality, percentile: 58Point, Part D claim volume, percentile in specialty: 33 · MIPS quality, percentile: 78Point, Part D claim volume, percentile in specialty: 48 · MIPS quality, percentile: 32Point, Part D claim volume, percentile in specialty: 45 · MIPS quality, percentile: 77Point, Part D claim volume, percentile in specialty: 27 · MIPS quality, percentile: 97Point, Part D claim volume, percentile in specialty: 78 · MIPS quality, percentile: 55Point, Part D claim volume, percentile in specialty: 77 · MIPS quality, percentile: 72Point, Part D claim volume, percentile in specialty: 85 · MIPS quality, percentile: 17Point, Part D claim volume, percentile in specialty: 5 · MIPS quality, percentile: 25Point, Part D claim volume, percentile in specialty: 63 · MIPS quality, percentile: 23Point, Part D claim volume, percentile in specialty: 30 · MIPS quality, percentile: 3Point, Part D claim volume, percentile in specialty: 80 · MIPS quality, percentile: 55Point, Part D claim volume, percentile in specialty: 98 · MIPS quality, percentile: 42Point, Part D claim volume, percentile in specialty: 50 · MIPS quality, percentile: 62Point, Part D claim volume, percentile in specialty: 52 · MIPS quality, percentile: 13Point, Part D claim volume, percentile in specialty: 65 · MIPS quality, percentile: 8Point, Part D claim volume, percentile in specialty: 58 · MIPS quality, percentile: 38Point, Part D claim volume, percentile in specialty: 25 · MIPS quality, percentile: 15Point, Part D claim volume, percentile in specialty: 22 · MIPS quality, percentile: 70Point, Part D claim volume, percentile in specialty: 47 · MIPS quality, percentile: 37Point, Part D claim volume, percentile in specialty: 38 · MIPS quality, percentile: 65Point, Part D claim volume, percentile in specialty: 42 · MIPS quality, percentile: 63Point, Part D claim volume, percentile in specialty: 82 · MIPS quality, percentile: 18Point, Part D claim volume, percentile in specialty: 97 · MIPS quality, percentile: 97Point, Part D claim volume, percentile in specialty: 32 · MIPS quality, percentile: 35Point, Part D claim volume, percentile in specialty: 67 · MIPS quality, percentile: 97Point, Part D claim volume, percentile in specialty: 20 · MIPS quality, percentile: 90Point, Part D claim volume, percentile in specialty: 3 · MIPS quality, percentile: 53Point, Part D claim volume, percentile in specialty: 7 · MIPS quality, percentile: 60Point, Part D claim volume, percentile in specialty: 90 · MIPS quality, percentile: 90Patrick Hammen, M.D., Part D claim volume, percentile in specialty: 71 · MIPS quality, percentile: 71
Part D claim volume vs MIPS quality, by specialty percentile

Each dot is one colon & rectal surgery physician peer from a representative sample of 60; the gold marker is Patrick Hammen, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.

✓
Board certification likely (heuristic, not verified)

Patrick Hammen, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Patrick Hammen, M.D.?

High performer (top quartile)

NPI registry status

Active

Issued 06/04/2006

NPI 1164461505

Primary specialty

Colon & Rectal Surgery Physician

Niche

1,642 US NPIs in this specialty

Medicare Part D claims

253 20% vs specialty avg

2024 prescription claims

Specialty avg: 210

MIPS final score

92.9/100 9.4 pts vs avg

Exceptional band

vs 83.5 national avg

Specialty distribution in Georgia

How Colon & Rectal Surgery Physician compares to other specialties among Georgia providers

Georgia providers
Behavior Technician7.5%Student in an Organized Heal…5%Pharmacist5%Family Nurse Practitioner4.8%Physical Therapist3.9%Professional Counselor3.6%Colon & Rectal Surgery Physi…0%
Largest specialties in Georgia (% of in-state providers)

Medicare quality performance, MIPS

Patrick Hammen, M.D.'s 2023 MIPS final score plotted against the Colon & Rectal Surgery Physician national average

High performer (top quartile)
MIPS Final Score
92.9/100
vs 83.5 national avg · 2023 performance year
0%100%National avg84%92.9%
MIPS final score (Colon & Rectal Surgery Physician) - 92.9/100 vs national avg 83.5
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

4441 ATLANTA RD SE STE 312
Smyrna, GA 30080
(470) 956-4200

Provider Details

NPI 1164461505
Specialty Colon & Rectal Surgery Physician
Credentials M.D.
Gender Male
NPI Issued 06/04/2006

CMS Quality Score (MIPS)

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

92.9348
Final Score
Measured-score avg: 83.5
80.3814
Quality
100
Promoting Interoperability

Reporting: Alternative Payment Model

Hospital and facility affiliations

Facilities where Patrick Hammen, 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.

Wellstar Medical Group LLC
Smyrna, GA

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

Industry payments received (2024) - CMS Open Payments transparency data

The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Patrick Hammen, M.D.. Source: openpaymentsdata.cms.gov.

Total received

$220

Largest payer

THD America, Inc.

Most common payment type

Food and Beverage

Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.

Brand vs generic prescribing mix · Typical

Patrick Hammen, M.D. - brand share 11.0%
Colon & Rectal Surgery Physician average

11% brand-name claims vs 89% generic, on 253 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.

253
Total Claims
$5K
Total Drug Cost
161
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
269.067
Total Day Supply
2,862
Brand vs Generic
11% brand / 89% generic
Brand Drug Cost
$1K
Generic Drug Cost
$4K
Opioid Claims
56 (22.1% rate)
Antibiotic Claims
21

Patient Demographics

Average Patient Age
68.9 years
Avg HCC Risk Score
1.44
Gender Split
39% female / 61% male
Age Distribution
<65: 22, 65-74: 105, 75-84: N/A, 85+: N/A

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.

What Patrick Hammen, M.D. prescribes most

Top Medicare Part D drugs by claim count, 2024

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2024
Drug Claims
Gavilyte-G
Peg3350/Sod Sulf,bicarb,cl/Kcl
63
Oxycodone-Acetaminophen
Oxycodone Hcl/Acetaminophen
54
Hydrocortisone
 28
Sod Sulf-Potass Sulf-Mag Sulf
Sodium, Potassium,mag Sulfates
28
Peg-3350 And Electrolytes
Peg3350/Sod Sulf,bicarb,cl/Kcl
16

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

More Colon & Rectal Surgery Physician in GA → All providers in Georgia → Compare specialties →

Colon & Rectal Surgery Physician Overview

How Patrick Hammen, M.D. fits within the Colon & Rectal Surgery Physician landscape nationally.

1,642
Colon & Rectal Surgery Physician Providers in US
50
States with Colon & Rectal Surgery Physician
210
Avg Claims per Provider

Patrick Hammen, M.D.'s 253 claims are above the specialty average of 210.

Nationwide Colon & Rectal Surgery Physician peers with similar MIPS or enrollment year

Two federal-record peer sets for Hammen, both outside Georgia so the neighborhoods are not geographic containment.

Similar MIPS final score

Nearest same-specialty clinicians by CMS MIPS final score (92.9 here).

Harry Reynolds 92.9 OH Scott Thornton 93.3 CT Janice Rafferty 92.5 OH Michelle Murday 93.3 UT

Same NPPES enumeration year (2006)

Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.

Harold Kennedy Reno, NV Richard Jackson San Antonio, TX Craig Foley Ogden, UT Susan Stein Washington, DC

Nearby Colon & Rectal Surgery Physician Providers in Georgia

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

One of 56 Colon & Rectal Surgery Physician providers enrolled in Georgia, 5 are shown here.

Dr. Ibrahim Adamu
MD
Newnan, GA
Dr. Nechol Allen
MD
Braselton, GA
Dr. Wayne Ambroze
MD
Atlanta, GA
Dr. Salim Amrani
MD
Augusta, GA
Dr. Luz Angel
MD
Snellville, GA

Compare Colon & Rectal Surgery Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is Patrick Hammen, M.D.'s specialty? ▼
Patrick Hammen, M.D. specializes in Colon & Rectal Surgery Physician and practices in Smyrna, Georgia. Credentials: M.D..
How much does Patrick Hammen, M.D. prescribe under Medicare Part D? ▼
In 2024, Patrick Hammen, M.D. wrote 253 Medicare Part D claims totaling $5K in drug costs for 161 beneficiaries.
What is Patrick Hammen, M.D.'s Medicare quality score? ▼
Patrick Hammen, M.D. has a CMS MIPS Final Score of 92.9/100 (Quality: 80.4). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Patrick Hammen, M.D. located? ▼
Patrick Hammen, M.D. is located at 4441 ATLANTA RD SE STE 312, Smyrna, GA, 30080. Phone: (470) 956-4200.
What is Patrick Hammen, M.D.'s NPI number? ▼
Patrick Hammen, M.D.'s National Provider Identifier (NPI) is 1164461505, issued on 06/04/2006.
Does Patrick Hammen, M.D. prescribe more brand-name or generic drugs? ▼
Patrick Hammen, M.D.'s prescribing is 11% brand-name and 89% generic drugs by claim count, with $1K in brand drug costs.
Does Patrick Hammen, M.D. prescribe opioids? ▼
Yes, Patrick Hammen, M.D. had 56 opioid claims in 2024 with an opioid prescribing rate of 22.1%.
How many Colon & Rectal Surgery Physician providers are there in the US? ▼
There are 1,642 Colon & Rectal Surgery Physician providers across 50 states in the US. The average Colon & Rectal Surgery Physician provider writes 210 Medicare Part D claims per year.
What drugs does Patrick Hammen, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Patrick Hammen, M.D.'s most frequently prescribed drugs include Gavilyte-G, Oxycodone-Acetaminophen, Hydrocortisone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Patrick Hammen, M.D. accept Medicare? ▼
Patrick Hammen, M.D. appears in CMS Medicare data with 253 Part D claims and 161 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Patrick Hammen, M.D.'s credentials? ▼
Patrick Hammen, M.D.'s NPI is 1164461505 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.
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 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

Compiled from official public sources by the editorial process.

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.