Please correct this sentence for me. Thanks a lot!?

Health management applies to all people, whether they are very healthy, marginally healthy, or unhealthy.

Not only does health management apply to sick people, but to all people whether they are healthy, semi-healthy or sick.

Ok now for the meaning, there's nothing wrong , but, since there's (Not Only) in the sentence, then u have to start the sentence with it ..

it just a simple English grammer rule ..

Not only + (auxiliary verbs) + the noun + verb in infinitive form , But ... + the rest of the sentence

note : you have to use the verb in the infinitive form, so u have to omit the s, and use the auxiliary verb (does in this case) + inf. verb

so the sentence would be rephrased as :

Not only does health management apply to sick people, but to all people whether they are healthy, semi-health or sick.

Health management not only applies to sick people, but all people, regardless of their health.

semi-healthy

It is OK, in English, I don't find any mistake.