HSA contributions
You won’t be able to continue making Medicare contributions if you make contributions to a health savings account (HSA).
Think carefully before enrolling in an HSA because HSA funds have more flexibility than insurance or Medicare benefits.
Conclusion
The answer to the question is yes, you can apply for Medicare while you are still working. But, should you? While Medicare is very helpful and can contribute greatly to covering medical cost, it is very important to ensure that you are in the best position to apply. If you already have a current plan, compare it with Medicare before making a decision to switch.
References
[1] https://www.hhs.gov/answers/medicare-and-medicaid/what-is-medicare-part-a./index.html
[2] https://www.hhs.gov/answers/medicare-and-medicaid/what-is-medicare-part-b/index.html
[3] https://www.hhs.gov/answers/medicare-and-medicaid/how-much-are-medicare-premiums/index.html
[4] https://www.healthline.com/health/medicare/medicare-part-b-cost