Apply Endocrine Coding Rules - Certified Professional Coder CPC

1. A physician documents "brittle diabetes" for a type 1 diabetic patient. How is this documented condition coded in ICD-10-CM?
   Answer: E10.9 — brittle diabetes is not a separately classified condition in ICD-10-CM ICD-10-CM does not have a specific code for "brittle diabetes." The condition is captured under the appropriate type 1 diabetes code based on the documented complications. Without a specific complication documented, E10.9 (type 1 diabetes mellitus without complications) would apply. "Brittle" is a clinical descriptor, not an ICD-10-CM axis. Coders should query the physician for any specific complications to code them correctly.
2. A patient is newly diagnosed with Cushing's syndrome due to an adrenal cortical adenoma. After surgical adrenalectomy, the postoperative diagnosis confirms benign adrenal adenoma as the cause. Which ICD-10-CM code is reported for the Cushing's syndrome?
   Answer: E24.8 ICD-10-CM E24.0 covers pituitary-dependent Cushing's disease, which is ACTH-dependent and caused by a pituitary adenoma or hypothalamic disorder. An adrenal cortical adenoma produces cortisol autonomously (ACTH-independent), which is classified under E24.8 (Other Cushing's syndrome). E24.2 is drug-induced Cushing's syndrome. E27.0 covers other adrenocortical overactivity such as congenital adrenal hyperplasia — not autonomous cortisol excess from an adenoma.
3. The operative report documents a laparoscopic right adrenalectomy for a benign adrenal adenoma. Which CPT® code is reported?
   Answer: 60650 CPT® 60650 covers laparoscopic adrenalectomy, including exploration of the adrenal gland with or without biopsy, transabdominal, lumbar, or dorsal approach. Codes 60540 and 60545 cover open adrenalectomy (60540 without exploration; 60545 with excision of adjacent retroperitoneal tumor). The laparoscopic approach is specifically captured by 60650.
4. A patient with an established diagnosis of type 2 diabetes presents for a routine diabetes management visit. The physician adjusts the patient's metformin dosage. Which Z code is appropriate as an additional code for this encounter?
   Answer: Z79.84 ICD-10-CM Z79.84 covers long-term (current) use of oral hypoglycemic drugs. When a type 2 diabetic patient is managed with oral agents such as metformin, Z79.84 is reported as an additional code per ICD-10-CM guidelines. Z79.4 is reserved for long-term insulin use. Accurately reporting the type of medication management distinguishes insulin-dependent from non-insulin-dependent treatment in the medical record.
5. A patient has primary hyperparathyroidism. An initial neck exploration is performed, and one adenomatous parathyroid gland is removed. Which CPT® code is reported?
   Answer: 60500 CPT® 60500 covers parathyroidectomy or exploration of parathyroid glands. This code is appropriate for initial parathyroid exploration with removal of one or more glands. Code 60502 is for re-exploration after previous parathyroid surgery; 60505 adds mediastinal dissection; 60512 is the add-on for autotransplantation.
6. A patient with type 2 diabetes develops a diabetic foot ulcer on the plantar surface of the right foot with muscle involvement. Which ICD-10-CM code category is used for the diabetic foot ulcer?
   Answer: E11.621 ICD-10-CM E11.621 covers type 2 diabetes mellitus with foot ulcer. The additional code for the site and severity of the ulcer (L97.4-L97.5 series for foot ulcers) is also required. The diabetes combination code E11.621 captures both the diabetes and the foot ulcer manifestation; however, a separate L97 code is added per ICD-10-CM instructions to identify the site and severity.
7. A surgeon removes a pituitary adenoma via a transsphenoidal approach. In which CPT® code range are transsphenoidal pituitary surgery codes found?
   Answer: 61546-61548 CPT® codes 61546-61548 cover transsphenoidal surgery for pituitary tumors. Code 61546 covers transsphenoidal excision of pituitary adenoma; 61548 covers hypophysectomy by transsphenoidal approach. The pituitary gland, although functionally part of the endocrine system, is surgically accessed via neurosurgical approaches and its procedure codes are found in the nervous system section (60000 series).
8. A patient undergoes removal of the right thyroid lobe only (right thyroid lobectomy), leaving the left lobe intact. Which CPT® code is reported?
   Answer: 60220 CPT® 60220 covers total thyroid lobectomy, unilateral, with or without isthmusectomy. This code represents removal of one complete lobe of the thyroid. Code 60210 is partial lobectomy; 60212 is partial lobectomy with contralateral subtotal lobectomy; 60240 is total thyroidectomy (both lobes).
9. A patient is diagnosed with type 2 diabetes mellitus with diabetic peripheral neuropathy. Which ICD-10-CM code combination correctly captures this condition?
   Answer: E11.40 ICD-10-CM provides combination codes for diabetes with its complications. E11.40 covers type 2 diabetes mellitus with diabetic neuropathy, unspecified — this combination code captures both the diabetes and the neuropathy in a single code. A separate neuropathy code (G63) is not needed and should not be reported when a combination code already captures the complication. E11.65 covers type 2 DM with hyperglycemia and does not address neuropathy at all.
10. A surgeon performs a reoperation for persistent hyperparathyroidism after a previous failed neck exploration. Which CPT® code is reported for the re-exploration?
    Answer: 60502 CPT® 60502 covers re-exploration of parathyroid glands. This code is specifically used when a previous parathyroid exploration was performed and a second surgery is required due to persistent or recurrent hyperparathyroidism. Code 60500 is for initial exploration only. Using the correct re-exploration code accurately reflects the increased complexity of operating in a previously explored field.
11. The physician documents "secondary diabetes mellitus due to chronic pancreatitis." Which ICD-10-CM code category applies?
    Answer: E08 — Diabetes mellitus due to underlying condition ICD-10-CM category E08 covers diabetes mellitus due to an underlying condition. When diabetes is caused by another disease process (such as chronic pancreatitis, Cushing's syndrome, or cystic fibrosis), E08 is the correct category. A "code first" instruction requires the underlying condition (chronic pancreatitis, K86.1) to be sequenced before E08.
12. The operative report documents removal of a thyroglossal duct cyst including the central portion of the hyoid bone (Sistrunk procedure). Which CPT® code is reported?
    Answer: 60280 CPT® 60280 covers excision of thyroglossal duct cyst or sinus. The Sistrunk procedure — which includes removal of the central portion of the hyoid bone to reduce recurrence — is the standard technique and is captured by 60280. Code 60281 is for recurrent thyroglossal duct cyst excision. Code 60200 covers excision of a thyroid cyst or adenoma, not a thyroglossal duct cyst.
13. A patient's record documents that the patient uses insulin to manage type 2 diabetes. Which additional ICD-10-CM code is required?
    Answer: Z79.4 When a type 2 diabetic patient uses insulin, ICD-10-CM Z79.4 (long-term current use of insulin) must be reported as an additional code per the Official Guidelines. This code distinguishes insulin-dependent management from oral hypoglycemic management. Z79.84 covers long-term use of oral hypoglycemic drugs — it is not reported for insulin. Z96.41 relates to presence of insulin pump, not routine insulin use.
14. A patient is seen for management of hypothyroidism. The physician prescribes levothyroxine and orders a TSH level. Which ICD-10-CM code is reported for primary hypothyroidism, unspecified?
    Answer: E03.9 ICD-10-CM E03.9 covers hypothyroidism, unspecified. E03.0 is congenital hypothyroidism with diffuse goiter; E03.1 is congenital hypothyroidism without goiter; E06.3 is autoimmune thyroiditis (Hashimoto's). When the documentation states "hypothyroidism" without further specification of the type or etiology, E03.9 is the appropriate code.
15. A patient with type 1 diabetes is admitted for diabetic ketoacidosis (DKA) with coma. Which ICD-10-CM code is reported?
    Answer: E10.11 ICD-10-CM E10.11 covers type 1 diabetes mellitus with ketoacidosis with coma. E10.10 covers type 1 DKA without coma. E11.01 is type 2 diabetes with DKA with coma. ICD-10-CM provides combination codes that capture both the type of diabetes, the complication (DKA), and the presence or absence of coma — documentation of all three elements drives precise code selection.
16. A physician performs an ultrasound-guided fine needle aspiration (FNA) of a thyroid nodule. How many CPT® codes are reported?
    Answer: Two codes — 10005 for the FNA with ultrasound guidance (a single combination code) CPT® 10005 (fine needle aspiration biopsy, with imaging guidance, first lesion, ultrasound) is a combination code that includes both the FNA procedure and the ultrasound guidance component. A separate ultrasound guidance code (76942) is not reported when 10005 is used, as the imaging is bundled into the FNA combination code. Additional lesions are reported with add-on code 10006.
17. A surgeon excises all four parathyroid glands due to hyperplasia and autotransplants parathyroid tissue to the forearm. Which CPT® code covers the parathyroid autotransplantation?
    Answer: 60512 CPT® 60512 covers parathyroid autotransplantation and is reported as an add-on code to the primary parathyroid procedure. Code 60500 covers parathyroidectomy; 60502 covers re-exploration; 60505 covers exploration with mediastinal dissection. The autotransplantation is a distinct service captured by add-on code 60512.
18. The documentation states: "The patient has no personal history of diabetes but has a strong family history of type 2 diabetes. Family history is the reason for today's diabetes screening." Which ICD-10-CM code is most appropriate as the first-listed diagnosis?
    Answer: Z13.1 Z13.1 covers encounter for screening for diabetes mellitus. When a patient presents specifically for diabetes screening due to risk factors (family history), the screening Z code is the first-listed diagnosis. Z83.3 is family history of diabetes and would be reported as an additional code. E11.9 is not appropriate since the patient has no confirmed diagnosis of diabetes.
19. A patient is admitted with hyperosmolar hyperglycemic state (HHS) in the setting of type 2 diabetes. Which ICD-10-CM code is reported?
    Answer: E11.00 ICD-10-CM E11.00 covers type 2 diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC). E11.01 covers type 2 DM with hyperosmolarity with coma. If the documentation does not specify coma, E11.00 is the appropriate code. If coma is present and documented, E11.01 is used. The presence or absence of coma is the key differentiator within the hyperosmolar subcategory.
20. A patient with an adrenal cortical carcinoma undergoes open right adrenalectomy with en bloc resection of the adjacent retroperitoneal tumor extension. Which CPT® code is reported?
    Answer: 60545 CPT® 60545 covers adrenalectomy with excision of adjacent retroperitoneal tumor. This code is used when the adrenalectomy involves en bloc removal of a retroperitoneal tumor extension beyond the adrenal gland itself. Code 60540 is adrenalectomy without this additional resection; 60650 is the laparoscopic approach; 60659 is laparoscopic with excision of adjacent retroperitoneal tumor.

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