Chat with us, powered by LiveChat

Latest Patient Center Updates


By editor
November 5, 2019
(From Left) CEO Ray Weaver and CMO Gregg DeNicola MD

Caduceus Medical Group is excited to announce, in its 20th anniversary year, it has finalized plans to renovate the historic Yorba Linda Packing House, originally built by the Yorba Linda Citrus Association in 1929. By 1912 farming had become a vital part of the community and business trade and many local residents grew orange and lemon trees.  However few had the time or money to send fruit to the store. In that year, farmers formed the Yorba Linda Citrus Association.  The association helped them build a packing house and send the fruit to stores all over the U.S.

The interior design will pay homage to the local history and Caduceus will partner with other local organizations that share the same vision and spirit that makes our Yorba Linda community, the "Land of Gracious Living." The building will be the future home to its primary care, specialty, ob-gyn, pediatrics, and physical therapy center.  The existing offices will move over to the Packing House and Caduceus will truly become the one stop shop for medical care for the entire family! 

To celebrate this milestone, Chief Medical Officer, Gregg DeNicola MD, shared the news with the Caduceus family and also made the announcements for the nominees of the annual company holiday gala, The Samme’s.  Nominees are chosen by staff in five categories- front office, back office, administrative, executive, and provider of the year.  The winners will be announced at the holiday ball later this holiday season.

Caduceus Medical Group, which remains defiantly owned and managed by its physicians, is excited for its new journey in the Packing House and will be showcasing the progress once the renovations begin.  Stay tuned!

Meet Our New Physician

We are excited to welcome primary care provider Dr. Alyssa Tonelli to our Yorba Linda family practice. She was born and raised in Yorba Linda and played varsity tennis at El Dorado and went on to graduate from Stanford with honors.

Afterward, she completed her DO degree at Western University of Health Sciences and pursued a family medicine residency with the Choctaw Nation Indians in Oklahoma. She is excited to be back home and serve the local OC community.

Dr. Tonelli is a board certified family medicine physician who has a passion for preventative medicine and building one-on-one relationships with patients. She enjoys partnering with patients to help them achieve their goals. In her free time, she likes to travel, explore new restaurants, and spend time with family and friends.

Reserve an appointment with Dr. Tonelli.

We have also recently expanded our specialty services at our Irvine location, Caduceus Jamboree, to include ENT (Ear, Nose, and Throat.)  Our ENT specialist in Yorba Linda, Dr. Faramarz Shabdiz, will now be available for appointments for our patients that work or live in South Orange County.  

Reserve an appointment with Dr. Shabdiz.  



It's Our 20th Year Anniversary!

In honor of our 20th year anniversary, Caduceus is highlighting employees each month that have been with our group since its inception.

November Honorees

Cindy Vineyard, Director of Claims

Cindy began her career in the medical field in 1982 and joined Yorba Linda Medical Group shortly thereafter.  When the physicians formed Yorba Linda Family Physicians, she moved with the practice to the Packing House and then later started her career at Caduceus.  In 2003 she took over the responsibility of managing the claims department and is still going strong 16 years later! 

Talia Wright, Director of Concierge Services

Talia began her journey as an administrative assistant in 1993 and at that time there were only six employees! She was responsible for many facets of the operation including opening mail, filing, answering phones, ordering lunches for meetings, and scheduling provider meetings.  In the mid-to-late 90's, as the company grew, she held positions in many departments including human resources, payroll, benefits/eligibility, referral processing, and various special projects.
In 2009, the concierge team was developed to provide meticulous patient care and outreach, and she assumed a role in the department and now manages a team of patient support specialists.

The Caduceus family honors you both and are proud to have you on our team!

Measles Outbreak Update from CMO Gregg DeNicola MD

By editor
May 1, 2019
Chief Medical Officer GREGG DENICOLA MD of Caduceus Medical Group

By now, I am sure you’re aware that we are suffering through a nationwide measles epidemic with Washington state being hit particularly hard. On Monday, the first confirmed case was identified in Orange County with three cases in Los Angeles County announced just prior to this. In the US, before the vaccine was introduced in 1963, there were 4 million measles cases a year with 48,000 hospitalizations and 500 deaths every year. Once the vaccines were available, those numbers dropped dramatically. In fact, in 2000, the CDC announced the measles was eradicated.

For the vaccine to work, it requires what is known as “herd” immunity. This means a certain percentage of people needs to be immunized to keep it from spreading through the population. Because measles spreads so easily , the percentage needed for herd immunity is really high at over 95%. When states began relaxing the laws regarding mandatory vaccinations, the percentage fell below 95%. This made the current outbreak inevitable and predictable.

In short, everybody in the community who can get the vaccine should to stop the virus respect spreading.

Prior to 1957, they were two nationwide epidemics that infected nearly 99% of the population. Therefore, for patients born before 1957, it is generally assumed you are immune. This would be a lifetime immunity and no shots or boosters are needed.

For patients that had the vaccine between 1963 -1967, it is felt that those vaccinations no longer give immunity. In simple language, those shots “didn’t count“.

All children and adults over the age of 12 months should have two measles vaccines. For most Americans, this would mean receiving a second shot in adulthood. If your first shot was between 1963 and 1967, you would need two more shots on top of that one.

As Chief Medical Officer of Caduceus, I call for all of our patients to come in to receive their update on the measles vaccination. We will be happy to work with you to catch you up so that you will not become infected or spread the infection.

If there is any doubt, it is safer to take the vaccine than guess, even if you do not actually need it. Additionally, we can check your blood to see if you are immune.

Although all health plans cover childhood vaccines, many do not cover adult vaccines. In the event your vaccine is not covered, our cash price is $120.

Please feel free to share this information with friends and family. It is essential to stop the infection now so there are no measles associated deaths in Orange County this year.

Gregg Denicola MD Chief Medical Officer

FDA proposes rule to notify women with dense breasts about increased cancer risk and imprecise mammograms

By editor
April 2, 2019

The FDA is proposing a rule for breast cancer screenings that would require doctors to give women more information about the risks associated with dense breasts.  Read the full article here.

Caduceus Chief Medical Officer, Gregg DeNicola MD, shares his take for our patients.

“Informing women that their amount of breast density may affect results of the mammogram and their risks be outlined just makes common sense; it’s hard to imagine any body opposing this recommendation. Yes; it is more time necessary to advise patients as the physician, but it is essential women are educated on the details of their mammogram.  In California, such a requirement already exists and is enforced so it will have little impact for our patients, but to set this as a national standard is just smart medicine.”

Video Visits

By editor
March 15, 2019

Save a trip to the office and schedule a video visit with your Caduceus provider right from your mobile device, tablet, laptop or desktop. You can schedule one SAME DAY or for a future date- whatever your preference!


Schedule your future video visit.
If you prefer one SAME DAY email us at [email protected].

Hormone replacement therapy for women- Is it right for you?

By editor
February 12, 2019

There have been many recent articles and online buzz about hormone replacement therapy for women and our Chief Medical Officer and Caduceus physician Gregg DeNicola MD wanted to weigh in on the discussion.

Sign with Hormone Replacement Therapy on itTo provide some perspective, in 2002, an extensive study of over 16,000 women supported by the National Institutes of Health, was halted after discovering that the drugs, a combination of estrogen and progestin, caused small increases in breast cancer, heart attacks, strokes and blood clots. Those risks outweighed the drugs’ benefits -a small decrease in hip fractures and a decrease in colorectal cancer. A year later a comparable study was also stopped in the UK after comparable findings.

Chief Medical Officer Dr. DeNicola agrees, “The fact is a large, prospective study has never been executed proving hormone replacement therapy is indeed safe.  This is an emotional issue and the data is definitely conflicting. Both sides have ample data to support their position.  At Caduceus, we do not routinely recommend or dissuade the use of HRT. The decision is individualized after discussion between the patient and provider. Until the evidence is more definitive, it is the most prudent policy for our patients.”

More questions?  Schedule an in-office or virtual video chat with your Caduceus provider.

Millions of Americans incorrectly think they have food allergies, study finds

By editor
January 15, 2019

Sign that says food allergies surrounded by foodYou may have read the story recently that new research suggests Americans may be over-diagnosing themselves with food allergies. A study published in the medical journal JAMA Network Open estimates that nearly 19 percent of adults think they have food allergies, but less than 11 percent actually do.

Caduceus Chief Medical Officer Gregg Denicola MD adds, “I have felt this way for a long time and agree less than 10 percent of Americans have documented food allergies.  Most allergies are to fish and nuts.  (more…)

New Peanut Allergy Drug Shows ‘Lifesaving’ Potential

By editor
November 18, 2018

The word Allergy on top of peanutsResults from a new study may lead to approval of what could be the first drug that ameliorates potentially deadly reactions in children with severe peanut allergies.  Caduceus physician and Chief Medical Officer Gregg DeNicola MD weighs in, “I agree with the spirit of the article; a breakthrough and very promising, but not necessarily a cure. Peanut allergy sufferers will need to abstain until further evidence can support the findings.”\


Colorectal cancer screening? To screen or not to screen before 50?

By editor
June 8, 2018

As CMO for Caduceus Medical Group, Gregg Denicola MD agrees that colon cancer is striking at a younger age than previous years.  Especially in high-risk populations, earlier screening may be beneficial.

He shares that the data that the American Cancer Society is using appears to be somewhat mixed and does not definitively show a benefit for screening prior to age 50. Also he notes, there would be increased costs in earlier screening recommendations and whether finding a cancer a few years earlier would decrease mortality has not been proven effective. (more…)

Current 2019 Caduceus Recommendations

By editor
May 18, 2018

Our physicians and Chief Medical Officer Gregg DeNicola MD recommend the following medical guidelines for our patients:

Ages 21,30,35, every other year between 40 and 50, and annually over 50.

Age 21, then ACOG guidelines: Age 21-29: Pap every 3 years, HPV not recommended.
Age 30-65: Pap & HPV every five years

Every other year starting at age 40 until age 50 and then annually. Acceptable to stop at age 75.

Every 10 years beginning at age 50. Acceptable to stop at age 75.

In females annually beginning with menopause or age 50, whiver is first and annually after.

Annually if you are a high risk- History of severe atypia, personal history of skin cancer, or a first degree relative with melanoma.

Medicare A-Z… We've Got you Covered!

By wpengine
May 14, 2015

If you are turning 65 and newly enrolled in Medicare, dissatisfied with your existing Medicare Advantage plan, or just have general questions regarding your coverage... we are here to help! Watch our video “Medicare A-Z.” We can also schedule a meeting for you with our in-house Medicare expert for private consultation.

Below is a summary of what Caduceus offers our seniors at NO COST and details that were discussed at the event:

  • We sit down with you and show you how Medicare works.
  • We educate you on ALL of your plan options.
  • We teach you how each plan benefit will work.
  • We input all of your drugs into the system to see which plans will cover your prescriptions at the lowest cost.
  • We make sure that you choose a plan your physicians accept.
  • We make sure you are placed with a network that will allow you to use the hospitals of their choice.
  • We answer any questions that you have.
  • We will help you apply for extra help if needed (low income subsidy).
  • We give each senior an annual benefit review to ensure you are always on a plan that fits all of your needs.

Email us at [email protected] to arrange a meeting at one of our office locations - Yorba Linda, Tustin, Irvine, or Laguna Beach.