Cristen J. Mazzella, MD
Internal Medicine Physician · Denver, CO
Cristen J. Mazzella, MD is an internal medicine physician with a practice address in Denver, Colorado, and NPI 1790715332, issued on Jul 3, 2006. Check the license (Colorado 47319, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Cristen J. Mazzella
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 47319 CO
01062341A IN
Self-reported in NPPES; status is on the state search - Practice location
- 10400 E Alameda Ave, Denver, CO 80247
- Phone
- (303) 338-4545
- Enumerated
- Jul 3, 2006
- Record last updated
- Jun 2, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 55608736 CO
- Medicare enrollment
- Enrolled (PECOS I20090408000278); accepts Medicare assignment
- Medical or professional school
- University Of Missouri, Columbia School Of Medicine, 2002
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,046 in Colorado → Look up another NPI →
Also registered at 10400 E Alameda Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Brittney Bastow, MDObstetrics & Gynecology Physician1447540208
Verify Cristen J. Mazzella in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 47319Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
53% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,505 Medicare Part D claims for 910 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 114 claims were for opioids.
Most prescribed
- Alendronate Sodium73 claims
- Gabapentin67 claims
- Lisinopril47 claims
- Atorvastatin Calcium39 claims
- Hydrocodone-Acetaminophen37 claims
- Triamcinolone Acetonide36 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.
Bills Medicare through one group practice
- Colorado Permanente Medical Group PCDenver, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Cristen J. Mazzella among 2,046 internal medicine physician records in Colorado
Cristen J. Mazzella, MD is one of 2,046 internal medicine physician records with a practice address in Colorado. 71% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 60% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2002 · median 2006 among the 1,090 with a school on file
- Record last updated2021 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
493 internal medicine physician records list a practice address in Denver
They are 493 of the 25,068 NPPES records with a practice address in Denver, and 2,046 internal medicine physician records in Colorado.
All 2,046 in Colorado → Every provider in Denver → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Brandy Allen, MDDenver, CO 802471609865468
- Daniel Barry, MDDenver, CO 802471841380425
- Elena Chebanova, MDDenver, CO 802471891724027
- David Downs, M.D.Denver, CO 802471275537698
- Dora Hilty, MDDenver, CO 802471194797431
- Barry Kalfon, MDDenver, CO 802471982624359
- Sukhjinder Khera, M.D.Denver, CO 802471124062427
- Ermin Kreso, MDDenver, CO 802471679584916
Common questions
What is Cristen J. Mazzella, MD's NPI number?
Cristen J. Mazzella, MD's National Provider Identifier (NPI) is 1790715332, issued on Jul 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Cristen J. Mazzella, MD located?
The NPPES record lists a practice address at 10400 E Alameda Ave, Denver, CO, 80247. Phone: (303) 338-4545. Providers update this record themselves, so call before visiting.
How can I verify Cristen J. Mazzella, MD's license?
NPPES lists Colorado license number 47319, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Cristen J. Mazzella, MD prescribe under Medicare Part D?
In 2024, Cristen J. Mazzella, MD had 1,505 Medicare Part D claims for 910 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.