The Central Health Service (CHS) is the medical service of the Central Government of India, providing medical care to central government employees and their families through Central Government Health Scheme (CGHS) dispensaries, hospitals, and Employee State services. UPSC CHS exam recruits Medical Officers (General Duty) who are posted at CGHS wellness centers, Central Government hospitals, railways hospitals, defense establishments, and other central government healthcare facilities across India. These are Group A Gazetted Officer positions under the Ministry of Health and Family Welfare.

The UPSC CHS exam consists of a written exam with 100 MCQs in 120 minutes covering three domains: Clinical Medicine (internal medicine, surgery, gynecology, pediatrics, orthopedics, ENT, ophthalmology, dermatology—breadth of MBBS curriculum), Public Health (epidemiology, biostatistics, health administration, national health programs, environmental health, occupational health), and Community Medicine (social and preventive medicine, family medicine, maternal and child health, health economics, health communication). The difficulty is hard, requiring comprehensive MBBS-level knowledge. A viva voce follows the written test for qualified candidates.

UPSC CHS Medical Officers are central government Group A Gazetted Officers placed in Level 10 (₹56,100–₹1,77,500) with NPA (Non-Practicing Allowance of 25% of basic), DA, central government HRA, and other benefits. The total compensation package including NPA and other allowances typically yields an annual CTC of ₹12–15 lakhs for newly recruited Medical Officers. CHS officers are also entitled to central government medical benefits, LTC, government accommodation, and pension under NPS. As Group A officers, they hold a position of prestige and administrative authority in central government health services.

UPSC CHS exam is a national-level examination with all-India competition and placement across any state/UT of India. State PSC medical officer exams are state-specific with state domicile requirements and postings within that state only. UPSC CHS offers Group A Gazetted Officer status while many state medical officer posts are in lower pay groups. UPSC CHS syllabus is comprehensive covering all clinical disciplines equally, while some state PSC exams may focus more on community medicine and public health. UPSC CHS exam has a viva voce component while many state exams are written-only. Central postings through CHS may involve more diverse placement locations across India.

MBBS doctors preparing for UPSC CHS should approach it as a comprehensive MBBS recall exam: revise standard clinical textbooks (Harrison for Medicine, Schwartz for Surgery, Williams for OB-GYN, Nelson for Pediatrics), focus equally on Community Medicine and Public Health as these carry significant weightage alongside clinical subjects, practice MCQs extensively from UPSC CHS previous year papers and similar-level medical entrance tests, master biostatistics and epidemiology concepts as these form the backbone of public health questions, and prepare for viva voce by staying current with National Health Mission programs, India's health indicators, and recent policy developments. Daily current affairs reading focused on health policy is essential.