Sergio R. Casillas-Romero, MD.
Colon & Rectal Surgery Physician · Norwich, CT
Sergio R. Casillas-Romero, MD. is a colon & rectal surgery physician with a practice address in Norwich, Connecticut, and NPI 1417035338, issued on Nov 1, 2006. Check the license (Connecticut 41831, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Sergio R. Casillas-Romero
- Credential
- MD.
- Primary taxonomy
- Colon & Rectal Surgery Physician 208C00000X
- License number
- 41831 CT
Self-reported in NPPES; status is on the state search - Practice location
- 12 Case St, Norwich, CT 06360
- Phone
- (860) 204-9126
- Enumerated
- Nov 1, 2006
- Record last updated
- Oct 30, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (860) 204-9146
- Medicaid ID
- 1417035338 CT
- Medicare enrollment
- Enrolled (PECOS I20040903000016); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest colon & rectal surgery physician records → All 54 in Connecticut → Look up another NPI →
Also registered at 12 Case St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rita Ammons, MASSAGE THERAPISTMassage Therapist1558664839
- Harjinder Chowdhary, MDRheumatology Physician1205942836
- Ajay Dalal, M.D.Diagnostic Radiology Physician1093710782
- Hana Dunham, LMFTMarriage & Family Therapist1861581647
- Daniel Gilmartin, M.D.Diagnostic Radiology Physician1760581680
- Marie Herrick, CNMAdvanced Practice Midwife1790050169
Verify Sergio R. Casillas-Romero in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 41831Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.2 times the Medicare Part D claims of the average colon & rectal surgery physician in 2024
428 Medicare Part D claims for 162 beneficiaries, against an average of 192 among the 1,836 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 120 claims were for opioids.
Most prescribed
- Tramadol Hcl58 claims
- Ondansetron Odt57 claims
- Ibuprofen45 claims
- Hydrocortisone35 claims
- Hydrocodone-Acetaminophen30 claims
- Gabapentin20 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 84.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $127.45
5 payments; by number, the most common kind was food and beverage; the largest payer was Medtronic, Inc. The 1,524 providers of this specialty with any payment received $3,468.16 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Hartford Healthcare Medical Group Specialists PLLCNorwich, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Sergio R. Casillas-Romero among 54 colon & rectal surgery physician records in Connecticut
Sergio R. Casillas-Romero, MD. is one of 54 colon & rectal surgery physician records with a practice address in Connecticut. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 11% of them.
- NPI issued2006 · 11% of these records are older, 54% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 80% of these records are
- Graduated1995 · median 2004 among the 43 with a school on file
- Record last updated2015 · 69% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208C00000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Colon & Rectal Surgery Physician providers in Connecticut
There are 54 colon & rectal surgery physician records in Connecticut.
All 54 in Connecticut → Every provider in Norwich → Colon & Rectal Surgery Physician nationwide →
The 8 colon & rectal surgery physician records with the nearest ZIP codes
- Daniel Lavy, M.D.Derby, CT 064181578841797
- Rafal Barczak, MDMeriden, CT 064511639316177
- Michael Baum, MDPutnam, CT 062601811955396
- R McCallum, MDPutnam, CT 062601124085691
- Maurizio NicheleOld Saybrook, CT 064751245264258
- Hulda Einarsdottir, M.D.New Haven, CT 065101962639963
- Vikram Reddy, M.D., PH.D.New Haven, CT 065101770717753
- George Yavorek, MDNew Haven, CT 065111568552461
Common questions
What is Sergio R. Casillas-Romero, MD.'s NPI number?
Sergio R. Casillas-Romero, MD.'s National Provider Identifier (NPI) is 1417035338, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Sergio R. Casillas-Romero, MD. located?
The NPPES record lists a practice address at 12 Case St, Norwich, CT, 06360. Phone: (860) 204-9126. Providers update this record themselves, so call before visiting.
How can I verify Sergio R. Casillas-Romero, MD.'s license?
NPPES lists Connecticut license number 41831, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Sergio R. Casillas-Romero, MD. prescribe under Medicare Part D?
In 2024, Sergio R. Casillas-Romero, MD. had 428 Medicare Part D claims for 162 beneficiaries; the average among colon & rectal surgery physician prescribers was 192. Part D covers Medicare prescriptions only.
What is Sergio R. Casillas-Romero, MD.'s MIPS final score?
The 2023 MIPS final score is 84.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.